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

Arithmetic Aptitude

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

A) 2
B) 2.5
C) 3
D) 3.5

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