Three tubes A, B and C can fill a tank in 12hours. After working at it together for 4 hours, C is closed andA and B can fill the remaining part in 12 hours. The number of hours taken by C alone to fill the tank is

Three tubes A, B and C can fill a tank in 12hours. After working at it

1.	Three tubes A, B and C can fill a tank in 12hours. After working at it together for 4 hours, C is closed andA and B can fill the remaining part in 12 hours. The number of hours taken by C alone to fill the tank is
A.	32 hrs
B.	28 hrs
C.	40 hrs
D.	36 hrs
Answer» E.

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Three tubes A, B and C can fill a tank in 12hours. After working at it together for 4 hours, C is closed andA and B can fill the remaining part in 12 hours. The number of hours taken by C alone to fill the tank is

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