Question a boat travels down the river from point a to, Ask an Expert

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Question: A boat travels down the river from point A to point B in t1 = 3 h, and in the opposite direction in t2 = 6 h.

Part A: How much time will it take for the boat to go from A to B with its engine turned off?

Please help for the above question, completely confused!! Show each steps if possible, Thanks.

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