Question
Ramu can row 12 km/hr. in still water. It takes him
twice as long to row up as to row down. Find the rate of the stream.Solution
Let the speed of the boat in still water =B =12km/h Speed of stream =S=x speed of the boat in downstream =B+S=12+x speed of the boat upstream =B-S=12-x B+S             B-S Time            1                 2 ATQ- (12+x) ×1 =(12-x) ×2 12+x =24-2x 3x =12 X =4km/h
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