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  4. Quantitative Aptitude
  5. Pipes & Cisterns

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

  • question_answer
    Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively If A is open all the time and B and C are opened for one hour each alternate then the tank will be full in

    A)  5 hours

    B)  5 hrs. 30 min.

    C)  6 hrs. 15 min    

    D)  7 hours

    Correct Answer: D

    Solution :

    [d] (A + B) pipes 1 H work\[=\frac{1}{12}+\frac{1}{15}=\frac{9}{60}\] (A + C) Pipes 1 H work\[=\frac{1}{12}+\frac{1}{20}=\frac{8}{60}\] [(A + B) + (A + C)] pipes 2 H work\[=\frac{17}{60}\] \[(2\times 5)\,\,H\,work=\frac{17}{60}\times 3=\frac{17}{20}\] Remaining work \[=1-\frac{17}{20}=\frac{3}{20}\] Total time = 6 + 1 = 7H.


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