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Railways R.R.C. (Patna) Solved Paper Held on 1st Shift 2-11-2014

  • question_answer
    A car covers four successive 3 km stretches at the speed of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr respectively. It's average speed over this distance is?

    A) 10 km/hr                       

    B) 25 km/hr

    C) 20 km/hr           

    D) 30 km/hr

    Correct Answer: C

    Solution :

    Time taken \[=\frac{3}{10}+\frac{3}{20}+\frac{3}{30}+\frac{3}{60}\] \[=\frac{3}{5}hours\] Now,     average speed \[=\frac{3+3+3+3}{3/5}\] \[=\frac{12\times 5}{3}km/hr\] \[=20\,km/hr\]


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