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2 Bumps

Are you smarter than a 5th grader? - Part 4

U2 has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them.

The flashlight must be walked back and forth. It cannot be thrown and other tricks like that are not needed to solve the problem. The solution is simply a matter of allocating resources in a certain order. Each band member walks at a different speed. A pair must walk together at the rate of the slower man's pace:

Bono: 1 minute to cross
Edge: 2 minutes to cross
Adam: 5 minutes to cross
Larry: 10 minutes to cross

For example: if Bono and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission.

Answer Question
 
SleepyCupcake

Asked by SleepyCupcake at 4:23 PM on Apr. 28, 2011 in Just for Fun

Level 17 (3,445 Credits)
Answers (12)
  • Answer that one, smarty pantses.
    SleepyCupcake

    Comment by SleepyCupcake (original poster) at 4:24 PM on Apr. 28, 2011

  • You know if my DH was home...He nails those kinds of questions!!
    But_Mommie

    Answer by But_Mommie at 4:25 PM on Apr. 28, 2011

  • The answer is Chocolate...
    maxsmom11807

    Answer by maxsmom11807 at 4:25 PM on Apr. 28, 2011

  • Bono and Edge first - 2 mins.
    Bono takes back flashlight - 3 min
    Adam and Larry - 13 min
    Edge walks flashlight back - 15 min
    Edge and Bono - 17
    Ataemommy

    Answer by Ataemommy at 4:25 PM on Apr. 28, 2011

  • Seriously though - I don't know the answer to this one.
    SleepyCupcake

    Comment by SleepyCupcake (original poster) at 4:25 PM on Apr. 28, 2011

  • Is twenty minutes the limit or something? You never actually asked a question in there.
    Anonymous

    Answer by Anonymous at 4:26 PM on Apr. 28, 2011

  • larry and bono cross first 10 minutes
    bono returns 1 min
    picks up adam then drops him off 5 minutes
    bono returns 1minute
    pick up edge and both are at the other side 2
    booger14

    Answer by booger14 at 4:27 PM on Apr. 28, 2011

  • Bono and Edge go across first, Bono comes back that's 3 minutes
    Larry and Adam go next, Edge comes back , that's 12 minutes
    Bono and Edge come across next =and that is 2 mintes.
    BradenIsMySon

    Answer by BradenIsMySon at 4:28 PM on Apr. 28, 2011

  • My answer has 19 minutes am I correct?
    booger14

    Answer by booger14 at 4:29 PM on Apr. 28, 2011

  • Booger -- not if the concert starts in 17 minutes.
    Ataemommy

    Answer by Ataemommy at 4:31 PM on Apr. 28, 2011

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