Answer: 8 miles
If you want to solve this problem you first have to set up an equation. The equation for the bottom line would be y=1/2x+3. The equation for the top line would be y=1/4x+5. Then you can put the two equations together and simplify. (1/2x+3=1/4x+5) And your answer should be 8 miles. Hope it helps!
*I'm not 100% sure if it's correct since I can't see the graph very well, but that's how you solve it*