2. Sample Papers
  3. Railways
  4. Quantitative Aptitude
  5. Pipes & Cisterns

Railways Quantitative Aptitude Pipes & Cisterns Sample Paper Pipes and Cisterns Sample Test Paper-11

  • question_answer
    Three pipes A, B and C can fill a tank in 6 minutes, 8 minutes and 12 minutes, respectively. The pipe C is closed 6 minutes before the tank is filled. In what time will the tank be full?

    A)  4 min  

    B)  6 min

    C)  5 min  

    D)  Data inadequate

    Correct Answer: A

    Solution :

    [a] Let it takes t minutes to completely fill the tank. Now, \[\frac{t}{6}+\frac{t}{8}+\frac{t-6}{12}=1\] or \[\frac{4t+3t+2t-12}{24}=1\] or 9t ? 12 = 24 or \[9t=36\Rightarrow t=4\,\min .\]


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