Task: Question Answering
Input (English): Problem: a can do a job in 18 days and b can do it in 30 days . a and b working together will finish twice the amount of work in days ? 
Options: a ) 29 ½ days , b ) 22 ½ days , c ) 92 ½ days , d ) 28 ½ days , e ) 92 ½ days
Output (English): b