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

  • question_answer
    A steamer goes downstream from one part to another in 4 hours. It covers the same distance upstream in 5 hours. If the speed of stream is 2 km/hr., the distance between the two ports is

    A)  45 km 

    B)  64 km

    C)  68 km 

    D)  80 km

    Correct Answer: D

    Solution :

    [d]        Let the distance between the two parts = ?x? km Let the speed of steamer in still water = ?y? km/hr. \[\therefore\] \[\frac{x}{y-2}=4\Rightarrow x=4y+8\]             ? (1) \[\frac{x}{y-2}=5\Rightarrow x=5y-10\]                         ? (2) From (1) and (2) 4y + 8 = 5y ? 10 \[\Rightarrow y=18\] \[\therefore\]  From (1) \[x=4\times 18+8=80\,km.\]


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