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18. Bridge

Four hikers want to cross a rope bridge where only two can cross each time. It is already night, so one person has to return the torch after each trip. Each person takes different times to walk across once: 5, 10, 20, & 25 minutes. What is the least amount of time necessary for everyone to cross?

Each pair is moving at the speed of the slowest person.

The 20 and 25 minutes hikers should cross together,
and neither of the two should return.

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What is two times two?

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Regular
Julessays...

60 minutes.

5 and 10 go first,

5 returns

20 and 25 go next

10 returns

5 and 10 go last.

10 + 5 + 25 +10 +10 = 60 minutes

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