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Discussion :: Boats and Streams

  1. A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?
    2. A.
    7 km/h
    B.
    5 km/h
    C.
    3 km/h
    D.
    2 (1/2) km/h

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    Answer : Option D

    Explanation :

    100 --- 10             DS = 10

    ? ----  1

    75 ---- 15         US = 5

    ? ----- 1           S = (10 - 5)/2

                                       = 2 2 ½ kmph

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