Can you solve the bridge riddle? – Alex Gendler


Taking that internship
in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol
just to see what it did probably wasn’t so smart, either, but now is not the time for regrets because you need to get away
from these mutant zombies fast. With you are the janitor,
the lab assistant, and the old professor. You’ve gotten a headstart,
but there’s only one way to safety: across an old rope bridge
spanning a massive gorge. You can dash across in a minute, while the lab assistant takes two minutes. The janitor is a bit slower
and needs five minutes, and the professor takes
a whole ten minutes, holding onto the ropes
every step of the way. By the professor’s calculations, the zombies will catch up to you
in just over 17 minutes, so you only have that much time
to get everyone across and cut the ropes. Unfortunately, the bridge can only hold
two people at a time. To make matters worse, it’s so dark out that you can barely see, and the old lantern you grabbed on
your way only illuminates a tiny area. Can you figure out a way
to have everyone escape in time? Remember: no more than two people
can cross the bridge together, anyone crossing must either
hold the lantern or stay right next to it, and any of you can safely wait in the dark
on either side of the gorge. Most importantly, everyone must be
safely across before the zombies arrive. Otherwise, the first zombie could step on
the bridge while people are still on it. Finally, there are no tricks to use here. You can’t swing across, use the bridge as a raft, or befriend the zombies. Pause the video now
if you want to figure it out for yourself! Answer in: 3 Answer in: 2 Answer in: 1 At first it might seem
like no matter what you do, you’re just a minute or two short of time,
but there is a way. The key is to minimize the time wasted
by the two slowest people by having them cross together. And because you’ll need to make
a couple of return trips with the lantern, you’ll want to have the fastest people
available to do so. So, you and the lab assistant quickly
run across with the lantern, though you have to slow down
a bit to match her pace. After two minutes, both of you are across, and you, as the quickest,
run back with the lantern. Only three minutes have passed. So far, so good. Now comes the hard part. The professor and the janitor take
the lantern and cross together. This takes them ten minutes since the janitor has to slow down
for the old professor who keeps muttering that he probably shouldn’t
have given the zombies night vision. By the time they’re across,
there are only four minutes left, and you’re still stuck
on the wrong side of the bridge. But remember, the lab assistant
has been waiting on the other side, and she’s the second fastest of the group. So she grabs the lantern
from the professor and runs back across to you. Now with only two minutes left,
the two of you make the final crossing. As you step on the far side of the gorge, you cut the ropes
and collapse the bridge behind you, just in the nick of time. Maybe next summer,
you’ll just stick to the library.

100 thoughts on “Can you solve the bridge riddle? – Alex Gendler

  1. There's a PC game similar to this riddle and I have completed the game😄

  2. But how did the group cross the bridge to get to the castle before running away from the zombies across it?

  3. Me: Well, I cant figure this out. Someone is not going to make it. Who is the slowest person
    Professor: I am
    Me:
    Professor:
    Me: (from the other side)

  4. I actully guessed it!!!! First the 1 and 2 min go then 1 min goes back and hands the lanterns to the 5 and 10 min to go down the bridge and then the 2 min will go back and get across with me. It will be exactly 17 min

  5. You don’t need to cut the ropes because the bridge will collapse under the weight of the zombies

  6. Well, i can give everyone else a piggyback in turn so that we just need at least 5 minutes, cmiiw.

  7. The answer is for you and the lab assistant go to the other side without the lantern because you aren't afraid of the dark and then the janitor and professor go with the lantern boom 5 minutes to spare

  8. My solution: I carry the old guy on my back, which ofc slows me down so I use 3 minutes… That leaves 14 minutes. I run back, 13 minutes. Walk with the janitor guy, 7 minutes. Run back, 6 minutes. Walk with the girl, boom 4 minutes left.

  9. Me and lab assistant- 2minutes, I walk give lap to old man and 5 minutes guy – 3 minutes, they walk- 13 minutes, lab assistant get lamp and walk across a bridge -15 minutes, we go back 17 minutes. Cut the rope and dance!

  10. I can do better. I let the prof and janitor walk. So thats 10 minutes. Then i ran and get the lantern= +2 mins. Then i walk with assistant +2 mins. So total of 14mins. 😉

  11. Just shuffle along the ropes like sideways weird monkey bars. All at the same time. You won't collapse the bridge anyway, 'cause you're not touching the ground.

  12. you carry the proffesor and the two of you cross the bridge(2mins). get back give the lamp to the lab assistant(1minute) and her and janitor cross the bridge(5mins). lab assistant goes to you and give the lamp(2mins)cross the bridge together(2mins).

  13. There are SO many ways you could do this while reducing time, all those restrictions are everything you claim to be wrong in the education system

  14. Me: you never said anything about lightsabers…* kills the zombies with lightsaber *

  15. I thought the fastest guy would just carry the 2 slowest people piggyback one at a time.

  16. I don’t understand why they need the light, it’s a rope bridge with handrails, you don’t need to see just feel your way along. Following that logic, send the janitor and the professor first each at their own pace. When the janitor reaches the other side( or six minutes) yell back and the professor can pass the message back, send the assistant wait 3 minutes then cross yourself, everyone across in 10 minutes. I added extra minutes to the cross times to make sure there are only two people on the bridge at one time.

  17. Lol there no weight restriction on the bridge just a number restriction… so if you carry someone it can still be considered one person…

  18. Alternative action, The young guy carries the old guy piggy back and repeats the process which in total time should be about 8 minutes.

  19. why do everybody need a light the bridge goes one way just walk in the direction that it's going and everybody gets across with 5 minutes to spare period

  20. If ONLY I saw this before my UCEED examination this year while it was still in my recommendations

  21. I mean ok maybe the lantern is not bright enough to iluminate the whole path but what if you just make the two slow persons go first (10 minutes) and then they make a sign with the lantern on the other side of the bridge to make sure they are no longer on the bridge, THEN you cross with the lab assistant (even without the lantern to directly iluminate the path you could tell how far away you are from them depending on its brightness) and since you are the two fastest you could go at a moderate speed and reach the other end at less than 7 minutes, also the bridge would break with the weight of the zombies

  22. Lab assistant and you 2 min to 1 min fro total 3
    Janitor and Prof take 10 min and LA 2 min fro total 15
    You and LA take 2 min total 17

  23. Shoot the professor in the knees … you and the cute chick go across and cut the ropes … get married and start a family … send the kids to business college …

  24. Wait. Couldn't you save even more time? Have Prof. and Janitor cross (10min), then Fast Guy cross (11min), get lantern, and cross back (12min), and finally cross over again with Lab Assistant (14min), leaving you with three minutes to spare. Am I wrong?

  25. Zombies will catch up in 17 mins, someone can cross with professor, that's 10 mins max, someone can cross with the janitor that's 5 mins max so 15 mins and everyone is across safely, there solved it right away

  26. If the guy had enough money to test zombies you’d think he’d have enough money to build a panic room

  27. Here is the solution: The professor goes first, holding to the ropes of the bridge all the way, like a blind man. After 5 minutes, take the janitor and cross with him the bridge. By the time you reach the end, the professor has arrived there too. Come back, grab the assistant, with another 2 minutes, you are all accross, total 13 minutes.

  28. Give the old guy a piggyback ride. Look at him, he’s literally just spine, he’s probably not that heavy. Geez, someone needs to feed him afterwards.

  29. I figured since the old man was going to hold the rope the whole time, he didn't need the light, and figured the 2nd slowest could go with him holding the rope, then me and 2nd fastest go for a time of 12 minutes

  30. All that is needed is to get everyone across then the zombies will fall cuz they are in numbers

  31. Easy, just carry the professor on your shoulders, then bam! No time loss at all!

  32. I've got that beat. Take the hot chick, cross the bridge, OK we're on the same page to this point, then keep going.

  33. They never said you could pull a bright side and get out a shotgun and shoot them to oblivion

  34. I'm confused on why you need the lantern lmao, betcha the janitor is scared or the dark or something. you only need 2 trips; assistant and you (2 minutes), but you leave the lantern with the slow. then the other 2 cross (10 minutes). ez, 5 minutes to spare

  35. Sooooo one flaw you push 1 person every time across the bridge carrying the lantern .________.

  36. Why not send the professor and janitor first (10 min) then you walk over the bridge (11 min) get the lantern and head back (12 min) then take the assistant with you and cross the bridge in 14 min giving you 3 minutes to spare?

  37. Grab the lantern and run across the bridge and cut it. As long as im concernd they all helped the scientist in making the zombies so they all die. Easy peesy

  38. technically you could cut the ropes even if the zombies are already on the bridge, so you have more time.

  39. Actually you don't need the assistant to carry the lantern in the last move, just cross the bridge since everyone already on the safe side

  40. If the professor doesn't ramble, he'd probably reach faster. I'd be like if you don't make it, it's on you old man. Plus he gave them night vision so like it's literally on him.

  41. They should've made it more clear that you must have the lantern while crossing.

  42. Run across with the girl, make sweet sweet love for 10 minutes, come back with the lamp for the janitor… Screw the old man, he defs created those zombies

  43. I could rate your IQ out of 45

    if you could solve these riddles

    no more simple pATteRn GuESsinG

  44. There's a trick ,the girl takes double the time U take and the oldest man takes double the time the less old man

  45. that feeling when you solve one riddle, I repeat myself, ONE RIDDLE, but you feel like you're a genius 😂

  46. I had exactly the same happen to me but they were Manchester United fans not Zombies. Same thing. I Just put a souvenir shop near the bridge and they spent hours in there. Got over the bridge at my leisure

  47. This doesn't make sense, 10 (time for the professor) + 5 (time for the janitor) + 2 (you and the lab assistant together) = exactly 17 minutes, no one needs to go back and the bridge is safe to go across in the dark since it's straight.

  48. Thank you Ted ed. For your random riddles I got a chocolate from my Phys ed teacher because I completed the riddle in her class.

  49. Same riddle as the fox and the hen had to be taken across river with a raft.

  50. Have the fastest carry the slowest across, then the second castest carry the 2nd. Slowest. Solved! Lol.

  51. Wouldn't it be faster to send the janitor and the professor first then run and get the lantern and run back, then cross with the lab assistant?

  52. Doesn’t make sense that the professor who has to hold the ropes at all times would need a light to illuminate his path.

  53. I know you said that you cant cheat, but I would bring a catapult on this adventure, run across with my pillows put them on the other side and catapult urself across with everyone else and cut the bridge :/

    logic for u

  54. Why not just carry someone on your back. You take 3 trips and you can get everyone across in 8 mins

  55. A mistake to assume that one person, once on the other side could not return.

    Heard the same type of riddle, years ago, involving a farmer, fox, chicken, bag of corn and a boat.

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