Answer:
The equation representing Number of miles in each section is 
Total Number of miles in each section is 2.5 miles.
Step-by-step explanation:
Given:
Total Miles bike race = 10 Miles
Number of sections = 4
Now we know that sections are divided in equal parts;
So Number of miles in each section can be calculated by dividing total miles of bike race with Number of section race.
The Number of miles in each section = 
Number of miles in each section = 
The equation representing Number of miles in each section is 
Solving the above equation we get;
Number of miles in each section = 
Hence Total Number of miles in each section is 2.5 miles.