Task: Question Answering
Input (English): Problem: circular gears p and q start rotating at the same time at constant speeds . gear p makes 10 revolutions per minute and gear q makes 40 revolutions per minute . how many seconds after the gears start rotating will gear q have made exactly 45 more revolutions than gear p ? 
Options: a ) 45 , b ) 80 , c ) 90 , d ) 100 , e ) 120
Output (English): c