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1. |
Two pipes A & B can fill a tank in 80 min & 60 min.. There is also an outlet C. If all three pipes are opened together, the tank takes 40 min to fill completely. How much time will C take to empty the |
A. | 210 min. |
B. | 220 min. |
C. | 230 min. |
D. | 240 min. |
Answer» E. | |