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

Two pipes can till a tank in 10 hours and 12 hours respectively whi

1.	Two pipes can till a tank in 10 hours and 12 hours respectively while a third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time will the tank be f
A.	7hrs 30 min
B.	7hrs 40 min
C.	7hrs 50 min
D.	8hrs 30 min
Answer» B. 7hrs 40 min

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

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