Task: Question Answering
Input (English): Problem: machine z takes 2 more hours than machine b to make 20 widgets . if working together , the machines can make 25 widgets in 3 hours , how long will it take machine z to make 40 widgets ? 
Options: a ) 5 , b ) 6 , c ) 8 , d ) 10 , e ) 12
Output (English): e