Task: Question Answering
Input (English): Question: Working alone, machine X can manufacture 1,000 nails in 10 hours. Working together, machines X and Y can manufacture 1,000 nails in 5 hours. How many hours does it take machine Y to manufacture 1,000 nails working alone?

 Option A: 3 9/17

 Option B: 5 1/3

 Option C: 10

 Option D: 11 1/5

 Option E: 18 4/7
Output (English): Option C