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Railways Sample Paper RRB (Group D) Sample Test Paper-12

  • question_answer
    On a journey across Kolkata, a taxi averages 50 km per hour for 50% of the distance. 40 km per hour for 40% of it and 20 km per hour for the remaining. The average speed in km/hour, for the whole journey is:

    A)  42                   

    B)  40

    C)  35                   

    D)  45

    Correct Answer: B

    Solution :

    [b] Total distance = 100 km. Total time\[=\frac{50}{50}+\frac{40}{40}+\frac{10}{20}=1+1+\frac{1}{2}=\frac{5}{2}\,\,hour\] Average speed\[=\frac{200\times 2}{5}=40\,\,kmph\]


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