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

  • question_answer
    A pipe can empty a tank in 40 min. A second pipe with diameter twice as much as that of the first is also attached with the tank to empty it. The two together can empty the tank in

    A) 8 min

    B) \[13\frac{1}{3}\]min

    C) 30 min

    D) 38 min

    Correct Answer: B

    Solution :

    [b] A pipe with double diameter will take half-time. So, the second pipe can empty the full tank in 20 min. Part emptied by both in 1 min \[=\left( \frac{1}{40}+\frac{1}{20} \right)=\frac{3}{40}\] Time taken to empty the full tank \[=\frac{40}{3}\min =13\frac{1}{3}\min \]


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