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A boat goes downstrem and reaches a fixed point in a river in 40min , turn back and again sails upstream to reach the starting

A boat goes downstrem and reaches a fixed point in a river in 40min , turn back and again sails upstream to reach the starting point. The speed of the stream is constant all the time and is 1|5 times the speed of the boat. By what percent the speed of the boat should be increased in upstream so that it take same time to reach the starting point as it took in downstream

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