Multiple Choice Questions on Two taps can fill the tank in 12 minutes and 15 minutes respectively The third tap can empty the tan........... for CDS Exam Preparation

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Multiple Choice Questions

Two taps can fill the tank in 12 minutes and 15 minutes respectively The third tap can empty the tan...........

Quantitative Aptitude (CDS) Pipes&cistern
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    Two taps can fill the tank in 12 minutes and 15 minutes respectively. The third tap can empty the tank in 6 minutes.5 minutes after two taps were opened the third tap is opened. The tank will empty in how much time? 

    6 min

    Incorrect Answer

    11 min

    Incorrect Answer

    9 min

    Incorrect Answer

    9/2 min

    Correct Answer
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    Explanation:

     tap A=12 min
     B=15 min
     third tap=6 min
     in 5 minute tank  filled=5(1/12 +1/15)
     =45/60
     =3/4
     third tap empty the tank in 6min
     t(1/6)=3/4
     t=18/4
     t=9/2

    By: bhavesh kumar singh
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