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 sate if B is used for half the time and A and B fill it together for the other half?
Part filled by (A + B) in 1 min. = 1/60 + 1/40 = 1/24
Suppose the tank is filled in x minutes.
Then, x/2(1/24 + 1/40) = 1
x/2 x 1/15 = 1
x = 30 min.
Back To Top