Task: Question Answering
Input (English): Problem: machine a and machine b are each used to manufacture 660 sprockets . it takes machine a 10 hours longer to produce 660 sprockets than machine b . machine b produces 10 percent more sprockets per hour than machine a . how many sprockets per hour does machine a produces ? 
Options: a ) 6 , b ) 6.6 , c ) 60 , d ) 100 , e ) 110
Output (English): a