Jill cycled a total of 3 hours and covered a total distance of 33 miles over two days. Jill's average speed on the first day was 4 mph (miles per hour) slower than that on the second day; however, she cycled 1½ hours longer on the first day than she cycled on the second day. What was her average speed on the second day ?   10 mph   14 mph   18 mph   22 mph   26 mph   Hint Half-n-half Clue