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

  • question_answer
    . A man swimming in a stream which flows 1.5 km/hr., finds that in a given time he can swim twice as fast with the stream as he can against it. At what rate does he swim?

    A)  4.5 km/hr.        

    B)  5.25 km/hr.

    C)  6 km/hr.          

    D)  None of these

    Correct Answer: A

    Solution :

    [a]        Rate of stream = 1.5 km/hr Let speed of man in still water = u km/hr and distance = d \[\therefore \] Downstream speed = (u + 1.5) km/hr Upstream speed = (u ? 1.5) km/hr \[\therefore \] From question \[\frac{2d}{u+1.5}=\frac{d}{u-1.5}\] \[\Rightarrow 2u-3=u+1.5\] \[\Rightarrow u=4.5\,km/hr\]


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