Trivia Question


Four people arrive at river with a narrow bridge that can only hold two people at a time. It’s nighttime and they have one torch that has to be used when crossing the bridge.

Person A can cross the bridge in one minute, Person B in two minutes, Person C in five minutes, and Person D in eight minutes. When two people cross the bridge together, they must move at the slower person’s pace.

Can they all get across the bridge in 15 minutes or less?

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Answer: Yes. 1. First, A and B cross the bridge and A brings the light back. This takes 3 minutes. 2. Next, C and D cross and B brings the light back. This takes another 10 minutes. 3. Finally, A and B cross again. This takes another 2 minutes.

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