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Two pipes A ad B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. @hat is the total time required to fill the tank? | |
A. | 10 minutes 20 seconds [Wrong Answer] |
B. | 11 minutes 45 seconds [Wrong Answer] |
C. | 12 minutes 30 seconds [Wrong Answer] |
D. | 14 minutes 40 seconds [Correct Answer] |