Task: Question Answering
Input (English): Question: Pipes A and B can fill a tank in 6 and 4 hours. Pipe C can empty it in 12 hours. If all pipes are opened together, then the tank will be filled in?

 Option A: 3hr

 Option B: 2hr

 Option C: 1hr

 Option D: 9/7hr

 Option E: 5/3hr
Output (English): Option A