Pipe P and Q running together can fill a cistern in 6 minutes If P takes 5 minutes less th...........

Quantitative Aptitude ( CCS) Pipes&cistern

Pipe P and Q running together can fill a cistern in 6 minutes. If P takes 5 minutes less than Q to fill the cistern, then the time in which Q alone can fill the cistern will be

10min

15min

30min

25min

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Explanation:

Let pipe P fills the cistern in x minutes.
Therefore, pipe Q will fill the cistern in (x+5) minutes.
Now, 1/x + 1/(x+5) = 1/6 → x = 10
Thus, the pipe P can fill in 10 minutes, so Q can fill in 10+5 =15 minutes.