A large tank can filled by A and B in 30 minutes and 45 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?	Answers
A) 30min B) 20min C) 25min D) 40min E) 45min
Part filled by A+B in 1 minute = 1/30 + 1/45 = 1/45   Suppose the tank is filled in x minutes   Then, x/2(1/45 + 1/45) = 1   x/2 * 2/45 = 1   x = 45 min   Answer is 45min
<result>E</result>
A large tank can filled by A and B in 30 minutes and 45 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?