Two pipes can fill a tank in 10 hours and 12 hours resp. while third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time the tank will be filled?

Two pipes can fill a tank in 10 hours and 12 hours resp. while third p

1.	Two pipes can fill a tank in 10 hours and 12 hours resp. while third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time the tank will be filled?
A.	7 hr. 30 min.
B.	7 hr. 25 min
C.	7 hr. 40 min
D.	7 hr. 50 min
Answer» B. 7 hr. 25 min

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Two pipes can fill a tank in 10 hours and 12 hours resp. while third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time the tank will be filled?

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