Final answer:
Jamal ran 6.1 miles.
Step-by-step explanation:
To solve this problem, we need to set up an equation. Let's assume that Jamal ran x miles. Since Keisha ran 2.4 miles more than Jamal, we can write the equation as x + 2.4 = 8.5. Now we can solve for x by subtracting 2.4 from both sides: x = 8.5 - 2.4. Simplifying the equation gives us x = 6.1. Therefore, Jamal ran 6.1 miles.