Task: Question Answering
Input (English): Question: Smith can do a work in 15 days while Johnson can do it in 25 days. How long will they take if both work together?

 Option A: 3 4/9 days

 Option B: 8 4/9 days

 Option C: 9 3/8 days

 Option D: 6 3/8 days

 Option E: 7 3/8 days
Output (English): Option C