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.2.5 hours
B.2 hours
C.3.5 hours
D.3 hours
Answer:D
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.2.5 hours B.2 hours C.3.5 hours D.3 hours