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SSC Quantitative Aptitude Speed, Time and Distance Question Bank Speed Time and Distance (I)

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

    A) \[14\frac{2}{5}km/h\]

    B) \[15\,\,km/h\]

    C) \[15\frac{1}{2}km/h\]

    D) \[16\,km/h\]

    Correct Answer: A

    Solution :

    [a] \[\because \]\[x=12\,km/h\]and \[y=18\,km/h\] \[\therefore \] Average speed \[=\frac{2xy}{x+y}=\frac{2\times 12\times 18}{12+18}\] \[=\frac{2\times 12\times 18}{30}=14\frac{2}{5}\,km/h\]


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