Task: Question Answering
Input (English): Problem: a and b complete a work in 50 days . a alone can do it in 40 days . if both together can do the work in how many days ? 
Options: a ) 1.075 days , b ) 0.185 days , c ) 0.065 days , d ) 0.045 days , e ) 0.0775 days
Output (English): d