Two taps P and R can fill a tank in 16 hours and 24 hours respectively while a third tap S can empty the same tank in 48 hours. If all three taps are opened together, then in how many hours the tank will be filled?

Two taps P and R can fill a tank in 16 hours and 24 hours respectively

1.	Two taps P and R can fill a tank in 16 hours and 24 hours respectively while a third tap S can empty the same tank in 48 hours. If all three taps are opened together, then in how many hours the tank will be filled?
A.	24
B.	16
C.	12
D.	8
Answer» D. 8