Answer:
480 miles
Equation:

Explanation:
#First we calculate the average time it takes to walk one mile:

#We then calculate the number of miles he walks in 8 weeks.
-Given he walks one mile per day, 4 times a week;

#Multiply the distance traveled by the average time per mile to get total time spent:

Hence, the walking time over the 8 period will be 480 minutes
#This can be represent as:
Let w be the number of weeks and t be the time in minutes.
The time spent on walking per week is

Therefore the time spent walking in w weeks is represented as:
