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Pipe A and Pipe B can fill a tank in 1 hour and 1 ¼ hours respectively. Both pipes are opened in the beginning and after some time, pipe B is closed. The tank is filled in 40 minutes. Pipe B was closed after | |
A. | 30 minutes [Wrong Answer] |
B. | 45 minutes [Wrong Answer] |
C. | 40 minutes [Wrong Answer] |
D. | 25 minutes [Correct Answer] |