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Discussion :: Boats and Streams

  1. A man can row 30 km downstream and 20 km upstream in 4 hours. He can row 45 km downstream and 40 km upstream in 7 hours. Find the speed of man in still water?
    2. A.
    15 kmph
    B.
    10 kmph
    C.
    12 kmph
    D.
    12.5 kmph
    E.
    None of these

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    Answer : Option D

    Explanation :

    Let the speed of the man in still water be a kmph and let the speed of the stream be b kmph.

    Now 30/(a + b) + 20/(a - b) = 4 and 45/(a + b) + 40/(a - b) = 7

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