Task: Question Answering
Input (English): 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?

 Option A: 120 gallons

 Option B: 200 gallons

 Option C: 170 gallons

 Option D: 180 gallons

 Option E: 250 gallons
Output (English): Option A