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: 228gallons

 Option B: 267gallons

 Option C: 120gallons

 Option D: 767gallons

 Option E: 167gallons
Output (English): Option C