Three taps A, B and C can fill thetank in 40, 48 and 60 hours respectively. How long (in hours) would the three taps take to fill the tank if all of them are opened together?

Three taps A, B and C can fill thetank in 40, 48 and 60 hours respecti

1.	Three taps A, B and C can fill thetank in 40, 48 and 60 hours respectively. How long (in hours) would the three taps take to fill the tank if all of them are opened together?
A.	12
B.	16
C.	10
D.	8
E.	6
Answer» C. 10