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 ?
A) 31 min B) 29 min
C) 28 min D) 30 min
A large tanker can be filled by two pipes
D) 30 min