This problem was published in MAA on line: Crossing a Rickety Bridge at Night By Flashlight.

http://www.math.utah.edu/~cherk/solutions/bridge/bridge.html

- 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:

**A**nnie crosses the bridge in 1 minute,

**B**ob crosses the bridge in 2 minutes,

- Volodia Mitlin crosses the bridge in 5 minutes,

**D**orothy crosses the bridge in 10 minutes.

**Solution:**http://www.math.utah.edu/~cherk/solutions/bridge/bridge.html

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