Answer:
11.75 miles
Step-by-step explanation:
Note that each distance is found by adding 1.625 to the previous one:
5.25 + 1.625 = 6.875 (which is equal to 6 7/8);
6.875 + 1.625 = 8.5 (which is equal to 8 1/2)
On Wednesday Jaime will bike 8.5 + 1.625 miles, or 10.125 miles, and
on Friday he will bike 10.125 miles + 1.625 miles, or 11.75 miles