A boat's speed in still water at 7km/h. in a stream flowing at 3 km/h, if it cover the same distance up and down the stream, then its average speed is
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average speed equal dist
2v1v2/v1+v2
2×3×3/3+3=18/6=3 m/s
average speed is 3m/s
2v1v2/v1+v2
2×3×3/3+3=18/6=3 m/s
average speed is 3m/s
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