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SSC Quantitative Aptitude Pipes & Cisterns Question Bank Pipe and Cistern (I)

  • question_answer
    Pipe A can fill a tank in 10 min and pipe B can empty it in 15 min. If both the pipes are opened in an empty tank, the time taken to make it full is

    A) 20 min

    B) 25 min

    C) 30 min

    D) None of the above

    Correct Answer: C

    Solution :

    [c] \[\because \]Part filled by pipe A in 1 min\[\frac{1}{10}\]and part empty by pipe B in 1 min\[=\frac{1}{15}\] Total tank filled in 1 min\[=\frac{1}{10}-\frac{1}{15}=\frac{3-2}{30}\frac{1}{30}\] Hence, the tank will be filled in 30 min.


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