A boy can swim a certain distance downstream in 2 hours and return in 5 hours. If the rate of stream is 3 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 + 3) × 2 = (x – 3) × 5 => 2x + 6 = 5x - 15 => 3x = 21 => x = 7 kmph
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