A large tanker can be filled by two pipes A and B in 60 minutes 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?
Q1. A large tanker can be filled by two pipes A and B in 60 minutes 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?
Answer: 30 min
Explanation: If total time is T, pipe B alone for T/2 fills T/80, and A+B together for T/2 fills T/48; setting T/80 + T/48 = 1 gives T = 30 minutes.