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Discussion :: Boats and Streams

  1. A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?

  2. A.

    12 kmph

    B.

    13 kmph

    C.
    14 kmph
    D.

    15 kmph

    E.

    None of these

    View Answer

    Workspace

    Answer : Option A

    Explanation :

    Let the speed of the boat in still water be x kmph. Then,

    Speed downstream = (x + 3) kmph,

    Speed upstream = (x - 3) kmph.

     

     (x + 3) x 1 = (x - 3) x 3
    2

     2x + 6 = 3x - 9

     x = 15 kmph.


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