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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
    4 pipes can fill a reservoir in 15, 20, 30 and 60 hours respectively. The first was opened at 6 am, second at 7 am third at 8 am and fourth at 9 am. When will the reservoir be full?

    A)  11 am 

    B)  12 pm

    C)  12.30 pm         

    D)  1.00 pm

    Correct Answer: D

    Solution :

    [d] Let the time be t hours after 6 am. \[\therefore \] \[\frac{1}{15}\times t+\frac{(t-1)}{20}+\frac{(t-2)}{30}+\frac{(t-3)}{60}=1\] \[\therefore \] \[4t+3(t-1)+2(t-2)+(t-3)=60\] \[\therefore \,\,\]t = 7 hours          \[\therefore \,\,\]it is filled at 1 pm


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