Three flood gates A, B and C can fill a reservoir in 6 hours. After working at it together for 2 hours, flood gate C is closed. Flood gates A and B can fill the remaining part in 7 hours. The number of hours taken by flood gate C alone to fill the reservoir is:

Three flood gates A, B and C can fill a reservoir in 6 hours. After wo

1.	Three flood gates A, B and C can fill a reservoir in 6 hours. After working at it together for 2 hours, flood gate C is closed. Flood gates A and B can fill the remaining part in 7 hours. The number of hours taken by flood gate C alone to fill the reservoir is:
A.	16
B.	10
C.	14
D.	12
Answer» D. 12