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1. |
Two pipes can fill a tank in 40 and 48 minutes respectively and a waste pipe can empty 3 gallons per minutes. All the three pipes working together can fill the tank in 30 minutes, The capacity of the tank is- |
A. | 0 gallons |
B. | 20 gallons |
C. | 80 gallons |
D. | 40 gallons |
Answer» E. | |