53. If the speed of a swimmer in still water is
9 km/hr, find the downstream speed of the
swimmer, when the riveris flowing with the speed
of 6 km/hr.
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Swimmer's speed in still water = x = 9 km/h
Rate of stream = y = 6 km/h
Therefore, Speed downstream = x + y
= 9 + 6 = 15 km/h
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