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  • question_answer
    A train goes from BaIlygunge to Sealdah at an average speed of 20 km/h and comes back at an average speed of 30 km/h. The average speed of the train for the whole journey is

    A) 27 km/h

    B) 26 km/h

    C) 25 km/h

    D) 24 km/h

    Correct Answer: D

    Solution :

    [d] Here, \[x=20\,km/h,\]\[y=30\,km/h\] \[\therefore \] Average speed \[=\frac{2xy}{x+y}\]                         \[=\frac{2\times 20\times 30}{50}\]                         \[=24\,\,km/h\]


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