Task: Question Answering
Input (English): Question: Laura can paint 1/x of a certain room in 20 minutes. What fraction W of the same room can Joseph paint in 20 minutes if the two of them can paint the room in an hour, working together at their respective rates?

 Option A: 1/(3x

 Option B: 3x/(x-3

 Option C: (x – 3

 Option D: x/(x-3

 Option E: (x-3
Output (English): Option C