324. A large tanker can be filled by two pipes A and B in 60 and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half? September 23, 2025 by Admin A. 15 min B. 20 min C. 27.5 min D. 30 min ✅ The correct answer is option D. 30 min.
