Three taps A, B and C can fill a tank in 10, 12 and 15 hours respectively. If all the taps are opened together, then in how many hours will the tank be filled?

Three taps A, B and C can fill a tank in 10, 12 and 15 hours respectiv

1.	Three taps A, B and C can fill a tank in 10, 12 and 15 hours respectively. If all the taps are opened together, then in how many hours will the tank be filled?
A.	4
B.	6
C.	8
D.	2
Answer» B. 6