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SSC Quantitative Aptitude Boats & Streams Question Bank Train and Boat (I)

  • question_answer
    A boat takes 90 min less to travel 36 m downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 m/h, the speed of the stream is

    A) 4 m/h

    B) 3 m/h

    C) 2.5 m/h

    D) 2 m/h

    Correct Answer: D

    Solution :

    [d] Let speed of the stream \[=x\,m/h\] Speed of the boat in still water\[=10\,m/h\] \[\therefore \]Speed of boat downstream\[=(10+x)\,m/h\] Speed of boat upstream\[=(10-x)\,m/h\] \[\therefore \]    \[\frac{36}{10+x}+\frac{90}{60}=\frac{36}{10-x}\] \[\Rightarrow \]            \[x=2\,m/h\]


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