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 ?  Select the correct option:
A) 30 min
B) 23 min
C) 25 min
D) 28 min
E) 40 min
(30 min+B) in 1 min = 1/60 + 1/40 = 1/24   x min then x/2(1/24+1/40) = 1   (x/2) x (1/15) = 1 ==&gt; x = 30 min   30 minNSWER 30 min
<result>A</result>
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 ?