Task: Question Answering
Input (English): Problem: a driver would have reduced the time it took to drive from home to the store by 1 / 3 if the average speed had been increased by 21 miles per hour . what was the actual average speed , in miles per hour , when the driver drove from home to the store ? 
Options: a ) 36 , b ) 42 , c ) 45 , d ) 48 , e ) 51
Output (English): b