Task: Question Answering
Input (English): Problem: a work as fast as b . if b can complete a work in 8 days independently , the number of days in which a and b can together finish the work in ? 
Options: a ) 2 days , b ) 2 2 / 3 days , c ) 4 days , d ) 5 days , e ) 6 days
Output (English): b