Two pipes A and B can fill a tank in 15 hours and 20 hours respectively while a third pipe C can empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hours, C is closed. The time taken to fill the tank is ?

Two pipes A and B can fill a tank in 15 hours and 20 hours respectivel

1.	Two pipes A and B can fill a tank in 15 hours and 20 hours respectively while a third pipe C can empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hours, C is closed. The time taken to fill the tank is ?
A.	12 hours
B.	13
C.	/
D.	16 hours
E.	18 hours
Answer» B. 13

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