Three pipes A B and C can fill a tank in 20 hours. After working at it together for 5 hours C is closed and A and B fill it in 30 hrs. C alone can fill it in

Three pipes A B and C can fill a tank in 20 hours. After working at it

1.	Three pipes A B and C can fill a tank in 20 hours. After working at it together for 5 hours C is closed and A and B fill it in 30 hrs. C alone can fill it in
A.	35 hrs
B.	40 hrs
C.	30 hrs
D.	28 hrs
Answer» C. 30 hrs

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Three pipes A B and C can fill a tank in 20 hours. After working at it together for 5 hours C is closed and A and B fill it in 30 hrs. C alone can fill it in

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