Question :
Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:
1. 60 gallons
2. 100 gallons
3. 120 gallons
4. 140 gallons
Answer :
3 - 120 gallons
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