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Discussion :: Boats and Streams

  1. The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is?
    2. A.
    6 kmph
    B.
    7 kmph
    C.
    8.5 kmph
    D.
    8 kmph

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    Answer : Option A

    Explanation :

    S = 1

    M = x

    DS = x + 1

    US = x - 1

    35/(x + 1) + 35/(x - 1) = 12

    x = 6

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