Question
Ramu can row 9 km/hr in still water. It takes him twice
as long to row up as to row down. Find the rate of stream.Solution
Let the speed of the boat in still water =B = 9km/h Speed of stream =S=x speed of the boat in downstream =B+S=9+x speed of the boat upstream =B-S=9-x B+S B-S Time 1 2 ATQ- (9+x) ×1 =(9-x) ×2 9+x =18-2x 3x =9 X =3km/h
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