A boy can swim a certain distance downstream in 4 hours and return in 7 hours. If the rate of stream is 6 kmph then what is the speed of boy in still water?
Let the speed of the boy in still water be x kmph. Then, (x + 6) × 4 = (x – 6) × 7 => 4x + 24 = 7x - 42 => 3x = 66 => x = 22 kmph
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