Four people are trying to cross a narrow broken bridge in the middle of the night. It is very dark, so they need a flashlight in order to see where all the broken planks are when crossing the bridge. Luckily, they have a flashlight, but only one. Unfortunately, the bridge can only support two people at a time, so they can at best cross in pairs.
The four people can walk across at different speeds: 1, 2, 5 and 10 minutes to cross the bridge. When two people cross, they cross the speed of the slower person.
What is the fastest time possible to get all 4 people safely across the bridge?
Hint: It is less than 19 minutes.
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1 comment:
17 minutes?
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