Question
A boy can swim a certain distance downstream in 3 hours
and return in 8 hours. If the rate of stream is 5 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 + 5) × 3 = (x – 5) × 8 => 3x + 15 = 8x - 40 => 5x = 55 => x = 11 kmph
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