Task: Question Answering
Input (English): Problem: a is thrice as good as workman as b and therefore is able to finish a job in 60 days less than b . working together , they can do it in : 
Options: a ) 20 days , b ) 22 1 / 2 days , c ) 24 days , d ) 25 days , e ) 30 days
Output (English): b