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Cross a bridge

Posted on: February 23rd, 2013 by

A group of four people has to cross a bridge. It is dark, and they have to light the path with a flashlight. No more than two people can cross the bridge simultaneously, and the group has only one flashlight. It takes different time for the people in the group to cross the bridge:

Annie crosses the bridge in 1 minute,

Bob crosses the bridge in 2 minutes,

Volodia Mitlin crosses the bridge in 5 minutes,

Dorothy crosses the bridge in 10 minutes.

How can the group cross the bridge in 17 minutes?

via Math puzzles.

2 Responses to Cross a bridge

  1. siddharth had this to say about that:

    1,2 go 1 comes back 3
    5,10 go 2 comes back 12
    1,2 go 2

  2. admin had this to say about that:

    Stud ra babu!

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