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The speed of a stream is 3 km per hour. A boat travels upstream 12 km and then returns to its original position downstream along the same route. If the speed of the boat in still water is 9 km per hour, what is the average speed of the boat for the entire round trip?

 Oct 18, 2022
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The average speed of the boat is 5 km per hour.

 Oct 19, 2022

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