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8 A swimmer can swim in still water at a speed of 15 km h...

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8 A swimmer can swim in still water at a speed of 15 km h A river is flowing at 5 km h The swimmer starts from a point and swim 1 km upstream and then returns by swimming downstream back to original position During this the average speed of his her swimming is 1 20 3 km h 2 10 km h 40 3 km h 1 km 4 20 km h 11 15 4

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