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    Question

    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?
    A 6 kmph Correct Answer Incorrect Answer
    B 8 kmph Correct Answer Incorrect Answer
    C 7 kmph Correct Answer Incorrect Answer
    D 9 kmph Correct Answer Incorrect Answer

    Solution

    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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