Two pipes A and B can separately fill a tank in 12 minutes and 15 minutes respectively. Both the pipes are opened together but 8 minutes after the start the pipe A is turned off. How much time will it take to fill the tank?	Answers.
A) 5min B) 9min C) 7min D) 6min E) 8min
8/12 + x/15 = 1   x = 5   5minNSWER:5min
<result>A</result>
Two pipes A and B can separately fill a tank in 12 minutes and 15 minutes respectively. Both the pipes are opened together but 8 minutes after the start the pipe A is turned off. How much time will it take to fill the tank?