Two pipes, P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes. P is turned off. in how many more minutes will Q fill the cistern

Two pipes, P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes. P is turned off. in how many more minutes will Q fill the cistern
1). 7 minutes
2). $7\frac{1}{2}$ minutes
3). 8 minutes
4). $8\frac{1}{4}$ minutes

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