Question
A boy can swim a certain distance downstream in 4 hours
and return in 5 hours. If the rate of stream is 3 kmph then what is the speed of boy in still water?Solution
Let the speed of the boy in still water be x kmph. Then, (x + 3) × 4 = (x – 3) × 5 => 4x + 12 = 5x - 15 => x = 27 kmph
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