The Collapsing Bridge Puzzle

The Collapsing Bridge Puzzle


  • Posted by  Downloadmela 
    10 Feb, 2012

    4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.

    Only two people can cross at a time.

    "A" takes a minute to cross.
    "B" takes 2 minutes.
    "C" takes 5
    and "D" takes 10 minutes

    How do they all cross before the bridge collapses?


    Solution

    A and B cross first using up 2 minutes.
    A comes back making it 3
    C and D cross making it 13 minutes
    then B crosses back over making it 15 minutes.
    And finally A and B cross together to make it 17 minute

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