Carol jogged 1 3/4 miles on 5 days last week. she jogged 2 1/4 miles on 4days this week. was her total distance greater last week or this week? how much greater? explain

This is the concept of arithmetic:
Given that Carol ran a total 1 3/4 miles for 5 days last week, the total distance covered was:
Total distance=(distance per day)×(total number of days)
=1 3/4×5
=7/4×5
=35/4
=8 3/4 miles
Total distance ran this week is:
Total distance=(2 1/4×4)
=9/4x4
=9 miles
therefore we conclude that the distance covered this week was greater than the distance covered last week.

b] this distance was greater by:
difference=(distance covered this week)-(distance covered last week)
=9-35/4
=(36-35)/4
=1/4
the answer is 1/4 miles