A tank can be filled with water by two pipes A and B together in 36 minutes. If the pipe B was stopped after 30 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in:

• ক 90 minutes ✅ সঠিক উত্তর
• খ 92 minutes
• গ 91 minutes
• ঘ 95 minutes