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A motor boat can travel 30 km upstream a...

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

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The correct Answer is:
Speed of boat = 10 km/h,
Speed of stream = 4 km/h
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