Task: Question Answering
Input (English): Question: Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 6 minutes the first is turned off. How many more minutes will it take for the cistern to fill after the first pipe is turned off?

 Option A: 1

 Option B: 1.5

 Option C: 2

 Option D: 2.5

 Option E: 3
Output (English): Option B