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ATQ, ATQ, Let the upstream speed and downstream speed of the boat be x km/h and y km/h, respectively. So according to question: 72/x + 180/y = 12 ………………. (i) Also, 54/x + 150/y = 9 ……….. (ii) Solving (i) and (ii), we get x = 15 and y = 30 So, the upstream speed and downstream speed of the boat are 15 km/h and 30 km/h, respectively. Speed of the boat in still water = (15 + 30)/2 = 22.5 km/h Speed of the stream = (30 – 15)/2 = 7.5 km/h So, the desired difference = 22.5 – 7.5 = 15 km/h
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