Task: Question Answering
Input (English): Question: P can lay railway track between two stations in 16 days. Q can do the same job in 12 days. With the help of R, they completes the job in 4 days. How much days does it take for R alone to complete the work?

 Option A: 9 days

 Option B: 9 (3/5

 Option C: 11 1/5 days

 Option D: 13 days

 Option E: 13 1/7
Output (English): Option B