Two pipes can fill a tank in 12 hours and 15 hours respectively. A third pipe can empty it is 20 hours. If the tank is empty and all the 3 pipes are opened then the tank will be full in ?

Two pipes can fill a tank in 12 hours and 15 hours respectively. A

1.	Two pipes can fill a tank in 12 hours and 15 hours respectively. A third pipe can empty it is 20 hours. If the tank is empty and all the 3 pipes are opened then the tank will be full in ?
A.	5 hrs
B.	8 hrs
C.	10 hrs
D.	14 hrs
Answer» D. 14 hrs

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Two pipes can fill a tank in 12 hours and 15 hours respectively. A third pipe can empty it is 20 hours. If the tank is empty and all the 3 pipes are opened then the tank will be full in ?

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