Multiple Choice Questions on Pipes P and Q can fill a tank in 3 hours and 10 hours respectively Pipe R can empty it in 15 hours I........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Pipes P and Q can fill a tank in 3 hours and 10 hours respectively Pipe R can empty it in 15 hours I...........

Quantitative Aptitude ( CCS) Pipes&cistern
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    Pipes P and Q can fill a tank in 3 hours and 10 hours respectively. Pipe R can empty it in 15 hours. If all the three pipes are opened together, then the tank will be filled in :

    7/2 hrs

    Incorrect Answer

    8/5 hrs

    Incorrect Answer

    30/11 hrs

    Correct Answer

    4 hrs

    Incorrect Answer
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    Explanation:

     Net part filled in 1 hour = (1/3 + 1/10 - 1/15)
    = 13/30 - 1/15
    = 11/30
    .'. The tank will be full in 30/11 hours.

    By: Deepak Dawra
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