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Discussion :: Boats and Streams

  1. A man can swim in still water at 4.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?
    2. A.
    3
    B.
    7.5
    C.
    2.25
    D.
    1.5

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    Answer : Option D

    Explanation :

    M = 4.5

    S = x

    DS = 4.5 + x

    US = 4.5 + x

    4.5 + x = (4.5 - x)2

    4.5 + x = 9 -2x

    3x = 4.5

    x = 1.5

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