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

  • question_answer
    A pipe can fill a cistern in 12 hours and another pipe can empty completely filled cistern in 18 hours. If both the pipes are opened together, the cistern will be filled in?

    A) 30 hours                       

    B) 36 hours

    C) 40 hours                       

    D) 44 hours

    Correct Answer: B

    Solution :

    The required time\[=\frac{12\times 18}{18-12}\]             \[=\frac{12\times 18}{6}\] \[=36\,\,hours\]


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