Pipes A and B can fill a tank in 20 hrs and 30 hrs respectively and pipe c can epmty the full tank in 40 hrs. If all the pipes are opened together, how much time will it take for the Tank to fill completely .. ?

Pipes A and B can fill a tank in 20 hrs and 30 hrs respectively and pi

1.	Pipes A and B can fill a tank in 20 hrs and 30 hrs respectively and pipe c can epmty the full tank in 40 hrs. If all the pipes are opened together, how much time will it take for the Tank to fill completely .. ?
A.	10 3/7 Hrs
B.	12 4/5 Hrs
C.	17 1/7 Hrs
D.	19 1/4 Hrs
Answer» D. 19 1/4 Hrs

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Pipes A and B can fill a tank in 20 hrs and 30 hrs respectively and pipe c can epmty the full tank in 40 hrs. If all the pipes are opened together, how much time will it take for the Tank to fill completely .. ?

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