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SSC Sample Paper SSC CGL - Sample Paper-4

  • question_answer
    A man rows a boat 18 km in 4 h downstream and returns upstream in 12 h. The speed of the stream (in km/h) is

    A)  1                                

    B)  1.5

    C)  2                                

    D)  1.75

    Correct Answer: B

    Solution :

    Rate downstream \[=\frac{18}{4}=\frac{9}{2}\,\,\text{km/h}\] Rate upstream \[=\frac{18}{12}=\frac{3}{2}\,\,km/h\] Now, speed of the stream \[=\frac{\text{Rate downstream}-\text{Rate upstream}}{2}\]             \[=\frac{\frac{9}{2}-\frac{3}{2}}{2}=\frac{6}{4}=\frac{3}{2}=1.5\,\,\text{km/h}\]


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