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Railways Quantitative Aptitude Boats & Streams Sample Paper Boats and Streams Sample Test Paper-14

  • question_answer
    56A man swims downstream 40 km in 4 hours and upstream 24 km in 3 hours. His speed in still water is

    A)  8 km/hr.          

    B)  8.5 km/hr.

    C)  9 km/hr.          

    D)  9.5 km/hr.

    Correct Answer: C

    Solution :

    [c]         Let speed in downstream \[=\left( x+y \right)\] Speed in upstream \[=\left( x-y \right)\] \[\therefore \] \[4(x+y)=40\] x+ y = 10                                 ?(1) and \[3(x-y)=24\] x ? y = 8                                  ?(2) By (1) and (2) x = 9, y = 1 \[\therefore \] Speed in still water is 9 km/h


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