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SSC Sample Paper Mock Test-13 SSC CGL Tear-II Paper-1

  • question_answer
    A man goes from a place A to B at a speed of 12 km/h and returns from B to A to a speed of 18 km/h. The average speed for the whole journey is

    A)  \[14\frac{2}{5}\text{km/h}\]

    B)  15 km/h

    C)  \[15\frac{1}{2}\text{km/h}\]

    D)  16 km/h

    Correct Answer: A

    Solution :

    Average speed \[=\left( \frac{2xy}{x+y} \right)\,\,\text{km/h}\] \[=\left( \frac{2\times 12\times 18}{12+18} \right)\text{km/h}\] \[=\left( \frac{2\times 12\times 18}{30} \right)\text{km/h}\]\[=14\frac{2}{5}\,\,\text{km/h}\]


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