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Railways R.R.C. (Gorakhpur) Solved Paper Held on 2nd Shift 30-11-2014

  • question_answer
    A person has to cover a distance of 100 km. If he drives at 60 kmph for the first 60 km, what speed must he maintain in the later part of the journey to achieve an average speed of 45 kmph?

    A) 40 kmph                       

    B) 45 kmph

    C) 50 kmph                       

    D) 30 kmph

    Correct Answer: D

    Solution :

    Suppose Required speed = x kmph        Then     \[\frac{60}{60}+\frac{40}{x}=\frac{100}{45}\] \[1+\frac{40}{x}=\frac{20}{9}\] \[\frac{40}{x}=\frac{11}{9}\] \[x=\frac{40\times 9}{11}\] \[=\frac{360}{11}\,km/hr\] \[=\]\[32.72\,\,kmph\]


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