Answer:
4 miles
Explanation:
Let's take a look at the graph. At two weeks, you have run 24 miles, while your friend has run 32 miles.
Since the questions askes for how much more your friend runs than you in one week, let's divide both values by 2:
You run 12 miles per week, and your friend runs 16 miles per week.
16 - 12 = 4 miles