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Discussion :: Boats and Streams

  1. Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

    2. A.

    16 hours
    B.

    18 hours
    C.

    20 hours
    D.

    24 hours

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    Workspace

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    Answer : Option D

    Explanation :

    Speed upstream = 7.5 kmph.

    Speed downstream = 10.5 kmph.

     Total time taken =[\( \frac { 1 05} { 7.5 }+\)\( \frac { 1 05} { 10.5 }]\)hours = 24 hours

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