Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled

Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in

1.	Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled
A.	1 hr
B.	2 hrs
C.	3 hrs
D.	4 hrs
Answer» D. 4 hrs

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Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled

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