Task: Question Answering
Input (English): Problem: machine p and machine q are each used to manufacture 770 sprockets . it takes machine p 10 hours longer to produce 770 sprockets than machine q . machine q produces 10 % more sprockets per hour than machine a . how many sprockets per hour does machine a produce ? 
Options: a ) 3 , b ) 5 , c ) 7 , d ) 9 , e ) 11
Output (English): c