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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:
Options:
A .  60 gallons
B .  100 gallons
C .  120 gallons
D .  180 gallons
E .  None of these
Answer: Option C

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