Question

a man rows a kilometre downstream in 20 minutes and upstream in 40 minutes . find the speed of man in still water?
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Answer 1

Answer:

The speed of the boat in still water is 20 km/hr and the speed of the stream is 5 km/hr. Find the downstream speed and the upstream speed.

Sol : Here we have b = 20 km/hr and w = 5 km/hr

So the downstream speed = b + w = 20 + 5 = 25km/hr

The upstream speed = b – w = 20 - 5 = 15 km/hr