Question
A boy can swim a certain distance downstream in 3 hours
and return in 5 hours. If the rate of stream is 6 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 + 6) × 3 = (x – 6) × 5 => 3x + 18 = 5x - 30 => 2x = 48 => x = 24 kmph
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