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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 ? | |
A. | 2 [Wrong Answer] |
B. | 2.5 [Wrong Answer] |
C. | 3 [Correct Answer] |
D. | 3.5 [Wrong Answer] |