Question
Raju travels 150 km in 7.5 hours moving downstream. The
speed of the stream is 5 km/h. Find the speed at which Raju should row the boat to reach back at the same time.Solution
Let the Speed of boat in still water =B km/h Speed of stream =S km/h Downstream speed of the boat = 150/7.5 =20 km/h Here, B + S = 20 B + 5 = 20 Â B = 15 speed of the boat in still water = 15 km/h Now, Raju needs to cover the same distance in 7.5 hours upstream. Upstream speed should be 20 km/h. B-S =20 B-5 =25 B =25km/h.
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