Task: Question Answering
Input (English): Problem: a car traveled 75 % of the way from town a to town b at an average speed of 90 miles per hour . the car travels at an average speed of s miles per hour for the remaining part of the trip . the average speed for the entire trip was 40 miles per hour . what is s ? 
Options: a ) 15 , b ) 20 , c ) 25 , d ) 30 , e ) 37.5
Output (English): a