Two pipes P and Q can fill a cistern in 12 and 15 min, respectively. I – McqOptions

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1.	Two pipes P and Q can fill a cistern in 12 and 15 min, respectively. If both are opened together and at the end of 3 min, the first is closed. How much longer will the cistern take to fill ?
A.	8 1/4 min.
B.	8 3/4 min.
C.	5 min.
D.	8 1/2 min.
Answer» B. 8 3/4 min.

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