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Pipe A can fill a tank in 4 hours and pipe B that can fill a tank in 2 hours. Both are opened when the tank is empty. Pipe A is closed 30 minutes before the tank overflows. How long did it take for the tank to overflow? | |
A. | 100 minutes [Wrong Answer] |
B. | 75 minutes [Wrong Answer] |
C. | 90 minutes [Correct Answer] |
D. | 80 minutes [Wrong Answer] |