What Is Relative Difference?

Erin, Alex, and Peyton are all long jumpers on their track and field team at their high school. Erin's PR is $16.5$ feet, Alex's PR is $18.5$ feet, and Peyton's PR is $17.6$ feet. Find how many percent farther Alex can jump compared to Peyton. Compare this to how much farther Peyton can jump compared to Erin. Which has the greater relative difference?