Question
A man can row a certain distance downstream in 1.5 hours
and return in 2.5 hours. If the rate of stream is 3 kmph, then what is the speed of the man in still water?Solution
Let the speed of the man in still water be x kmph. Then, (x + 3) × 1.5 = (x - 3) × 2.5 => 1.5x + 4.5 = 2.5x - 7.5 => x = 12 kmph.
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