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Railways R.R.C. (Kolkata) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    In a 100 m race, Kamal defeats Bimal by 5 seconds. If the speed of Kamal is 18 km/hr, then the speed of Bimal is ?

    A) 15.4 km/hr                    

    B) 14.5 km/hr

    C) 14.4 km/hr                    

    D) 14 km/hr

    Correct Answer: C

    Solution :

    Suppose speed of Bimal = x km/hr Then,             \[\frac{100\times 18}{5x}-\frac{100\times 18}{18\times 5}=5\]             \[\frac{100\times 18}{5x}=25\]                \[x=\frac{100\times 18}{25\times 5}\]                   \[=14.4\,\,km/hr\]


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