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?

• ক 6 minutes 15 seconds
• খ 5 minutes 15 seconds
• গ 12 minutes
• ঘ 8 minutes 15 seconds ✅ সঠিক উত্তর