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Four people, (A, B, C, and D) need to get across a river, and there is only one boat. The boat can only hold two people at a time and will only go as fast as the slowest person in the boat. If it takes A one minute to cross, B two minutes, C five minutes, and D seven minutes, what is the shortest time for all 4 people to cross the river?
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Architect

Interviewed at NVIDIA

4.4
Sep 23, 2009

Four people, (A, B, C, and D) need to get across a river, and there is only one boat. The boat can only hold two people at a time and will only go as fast as the slowest person in the boat. If it takes A one minute to cross, B two minutes, C five minutes, and D seven minutes, what is the shortest time for all 4 people to cross the river?

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