Task: Question Answering
Input (English): Problem: on the first day of her vacation, louisa traveled 160 miles. on the second day, traveling at the same average speed, she traveled 280 miles. if the 160 - mile trip took 3 hours less than the 280 - mile trip, what was the average speed, in miles per hour ?
Options: a. 40, b. 45, c. 46, d. 48, e. 50
Output (English): a