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

  • question_answer
    Having the same capacity 9 taps fill up a water tank in 20 min. How many taps of the same capacity required to fill up the same water tank in 15 min? [SSC CGL Tier n, 2014]

    A) 10

    B) 12

    C) 15

    D) 18

    Correct Answer: B

    Solution :

    [b] 9 tap's one minute work\[=\frac{1}{20}\] 1 tap's one minute work\[=\frac{1}{180}\] Let x taps are used to fill the tank in 15 min, so \[x\times \frac{1}{180}=\frac{1}{15}\] \[x=\frac{180}{15}=12\] 12 taps can fill the tank in 15 min.


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