Task: Question Answering
Input (English): Question: Working at their respective constant rates, Paul, Abdul and Adam alone can finish a certain work in 3, 4, and 5 hours respectively. If all three work together to finish the work, what fraction M of the work will be done by Adam?

 Option A:  1/4

 Option B:  12/47

 Option C:  1/3

 Option D:  5/12

 Option E:  20/47
Output (English): Option B