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1. |
Pipes A and B can fill a tank in 12 minutes and 15 minutes, respectively. The tank when full can be emptied by pipe C in x minutes. When all the three pipes are opened simultaneously, the tank is full in 10 minutes. The value of x is: |
A. | 24 |
B. | 18 |
C. | 15 |
D. | 20 |
Answer» E. | |