A group of fourpeople has to cross a bridge. It is dark, and they have to lightt

Question

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

Annie crosses the bridge in 1minute,
Bob crosses the bridge in 2 minutes,
Chris crosses the bridge in 5 minutes,
Dorothy crosses the bridge in 10 minutes.


Howcan the group cross the bridge in 17 minutes? A group of fourpeople has to cross a bridge. It is dark, and they have to lightthe path with a flashlight. No more than two people can cross thebridge simultaneously, and the group has only one flashlight. Ittakes different time for the people in the group to cross thebridge:

Annie crosses the bridge in 1minute,
Bob crosses the bridge in 2 minutes,
Chris crosses the bridge in 5 minutes,
Dorothy crosses the bridge in 10 minutes.


Howcan the group cross the bridge in 17 minutes?

Explanation / Answer

Total # of possible ways to cross the bridge = 3 AB, C, D = 2+5+10= 17min B, AC, D = 2+5+10= 17min B, C, AD = 2+5+10= 17min Hope it was helpful

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