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Brain Teaser (1) !!!

Discussion in 'Random Discussion' started by oldie, Oct 20, 2003.

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  1. oldie

    oldie Thread Starter

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    BRAINTEASER NUMBER 1

    There are no tricks - this is a straight forward problem. This is supposed to be one of the questions which potential Microsoft employees are asked

    U2 have 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 that crosses the bridge, either 1 or 2 people, must have the flashlight with them. The flashlight must be carried back and forth, it cannot be thrown, etc. 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 by the time 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.

    There is no trick to this. It is a simple movement of resources in the appropriate order. There are two known answers to this problem. Microsoft expects you to answer this question in under 5 minutes!


    Took me a little longer ;) Oldie
     
  2. marcus77

    marcus77

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    HA! I finally got it!!!

    Bono & Edge go across first - 2min
    Edge comes back - 2min
    Hands light to Adam & Larry, who cross next - 10 min
    They give the light to Bono, who crosses back - 1 min
    Bono & Edge cross back last - 2 min
    total time = 17min
     
  3. redalert95

    redalert95

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    Who the hell cares about U2 anyway. Id just push them off the bridge.
     
  4. pyritechips

    pyritechips Gone but Never Forgotten

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    Grrrr!! Another friggen math quizzer! :mad:
     
  5. john1

    john1

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    i agree with redalert on this.
     
  6. RSM123

    RSM123

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  7. pronute

    pronute

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    If they use a transportor it would take 20 ns.
     
  8. p51

    p51

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    What about piggy back rides? Bonon gives Larry a ride and returns. Edge gives Adam a ride, and returns, then Edge and Bono cross.
     
  9. oldie

    oldie Thread Starter

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    Marcus77 - almost there but not quite - clue !!!

    2 people cross
    1 goes back
    2 people cross
    1 goes back
    2 people cross

    There are no tricks of people being carried on someone else's back, etc.

    OK, which people cross at which time still has to be worked out. There's only 17 mins.

    Larry takes 10 mins, Adam 5. You can't allow them to cross separately, since that would be 15 mins, and you'll never solve the puzzle. So they cross together. Which takes 10 mins. You can't allow either of them to make the return trip with the flashlight either, can you? Since they would still have to get back across again. That would take too long.

    Regards - Oldie
    :)
     
  10. angelize56

    angelize56 Always remembered in our hearts

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    Bono & Edge go across first 2 minutes
    Edge comes back with torch 2 minutes
    Adam & Larry go across 10 minutes
    Bono comes back with torch 1 minute
    Bono & Edge go across again 2 minutes
     
  11. oldie

    oldie Thread Starter

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    RSM123 - hey mate why spoil a thread that others might find entertaining - there seems little or no point to it - I am sure we could all do the same with other threads - but most of us (I hope) allow the other few thousand members to take part - maybe you should delve into Edwards web site ???

    http://www.edwdebono.com/cort/index.html

    With respect - Oldie :)
     
  12. angelize56

    angelize56 Always remembered in our hearts

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    Ok on to #2! :D
     
  13. marcus77

    marcus77

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    ~by angelize56
    That's the answer I gave, just simplified.

    So, if my and angelizes' answers are incorrect, what is the correct answer?
     
  14. angelize56

    angelize56 Always remembered in our hearts

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    Marcus: We're wrong!!! :eek:

    Did you ever get a new cat?? I've been wondering.

    Take care! angel :)
     
  15. oldie

    oldie Thread Starter

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    OK - Here is the answer


    Bono and Edge cross the bridge - 2 minutes

    Bono returns with the light - 1 minute

    Larry and Adam cross - 10 minutes

    Edge returns with the light - 2 minutes

    Bono and Edge cross the bridge - 2 minutes.

    Total 17 minutes!!

    Thanks for the interest - regards Oldie - can someone shoot RSM123 [​IMG]
     
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