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

  • question_answer
    A motor boat whose speed is 15 km/h in still water goes 30 km downstream and comes back in four and a half hours. The speed of the stream is:

    A)  46 km/h           

    B)  6 km/h

    C)  7 km/h

    D)  5 km/h

    Correct Answer: D

    Solution :

    [d] Let the speed of the stream be x km/h. Then, upstream speed = (15 ? x) km/h. and downstream speed = (15 + x) km/h. Now, \[\frac{30}{(15+x)}+\frac{30}{(15-x)}=4.5\] Checking with options, we find that x = 5 km/h.


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