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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