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

  • question_answer
    If two pipes can fill a tank in 20 min and 30 min, respectively. If both pipes are opened and after what time should first pipe be closed, so that tank will be filled in 10 min?

    A) 10 min

    B) 12 min

    C) 20 min

    D) 8 min

    Correct Answer: D

    Solution :

    [d] Let after x min first pipe was closed. According to the question, \[\frac{x}{20}+\frac{10}{30}+\frac{x}{30}=1\] \[\Rightarrow \] \[x\left( \frac{2+3}{60} \right)=1-\frac{1}{3}\]\[\Rightarrow \]\[x=8\] Hence, first pipe must be closed after 8 min, so that the tank will be filled in 10 min.


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