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    Question

    A boy can swim a certain distance downstream in 6 hours

    and return in 7 hours. If the rate of stream is 3 kmph then what is the speed of boy in still water?
    A 33 kmph Correct Answer Incorrect Answer
    B 40 kmph Correct Answer Incorrect Answer
    C 37 kmph Correct Answer Incorrect Answer
    D 39 kmph Correct Answer Incorrect Answer

    Solution

    Let the speed of the boy in still water be x kmph. Then, (x + 3) × 6 = (x – 3) × 7 => 6x + 18 = 7x - 21 => x = 39 kmph

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