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Thread: Puzzle - Jungle crossing

  1. #1
    PW Fan LastWarrior's Avatar
    Join Date
    Jun 2009
    Location
    India
    Posts
    76

    Smile Puzzle - Jungle crossing

    There are five people at one end of jungle and they have only one lamp. All needs to cross jungle and be at other end. Every body has different speed of crossing jungle. Five different times taken for crossing jungle from one end to other are 1, 3, 6, 8, 12 minutes. Round trip would take twice amount of time.

    Lamp would last only for 30 minutes and at a time only two people can cross.
    The total time taken when two people are crossing is the maximum time of them.
    Lamp has to be there while crossing as it is a night time.

    What should be the sequence of crossing?
    Please no thowing of lamp.



  2. #2
    PolicyWala Newbie
    Join Date
    Mar 2009
    Posts
    52

    Smile

    1st round----1 and 3 will go and 1 will come back
    1,6,8,12======3
    total time=3+1=4 minutes

    2nd round----8and 12 will go and 3 will come back
    1,3,6====8,12
    total time---4+12+3=19 minutes

    3rd round --- 1 and 6 will go and 1 will come back
    1,3====6,8,12
    total time----19+6+1=26 minutes

    4th round..1 and 3 will go and all will be right there
    no one====1,3,6,8,12
    total time---26+3=29 minutes

    Hoping I am right.

  3. #3
    PolicyWala NewBie
    Join Date
    Apr 2009
    Location
    New Delhi
    Posts
    14

    Default

    29 sec
    combinations: 1,3
    12,8
    6,1
    1,3


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