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Crossing the bridge
Posted 10 March 2013 - 04:15 AM
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,
Caren crosses the bridge in 5 minutes,
Dorothy crosses the bridge in 10 minutes.
How can the group cross the bridge in 17 minutes?
Posted 10 March 2013 - 08:23 AM
Edited by sabjiwala, 10 March 2013 - 08:26 AM.
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