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ATQ, Let the speed of the stream be 'y' km/h. Speed of the boat in still water = 160/10 =16 km/h Given, 
3(16+y) = 5(16−y) 4 8+3y = 80−5y 48+3y+5y = 80 8y = 32 y = 32/8 = 4 km/h Therefore, required difference = 16−4 = 12 km/h
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