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A ,motorboat can travel 30 km upstream a...

A ,motorboat can travel 30 km upstream and 28 km downstream in 7 h. It can travel 21 km upstream and return in 5 h. Find the speed of the boat in still water and the speed of the stream.

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The correct Answer is:
The speed of the motorboat in still water is 10 km/hr and the speed of the stream is 4 km/hr.
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