Task: Question Answering
Input (English): Problem: john completes a piece of work in 10 days , rose completes the same work in 40 days . if both of them work together , then the number of days required to complete the work is ? 
Options: a ) 5 days , b ) 8 days , c ) 10 days , d ) 12 days , e ) 14 days
Output (English): b