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Two pipes A and B are attached to a cistern. Pipe A can fill the cistern in 3 hours while pipe B can empty it in 9 hours. When both the pipes are opened together, find the time taken to fill the cistern. | |
A. | 3 hours [Wrong Answer] |
B. | 4.5 hours [Correct Answer] |
C. | 2.8 hours [Wrong Answer] |
D. | 2.25 hours [Wrong Answer] |