Final answer:
The unit rate represents the time it takes for each runner to complete one mile. Josiah's unit rate is 5.5 minutes per mile, while Elena's unit rate is 5.25 minutes per mile. Elena runs at a slightly faster pace per mile than Josiah.
Step-by-step explanation:
The unit rate represents the time it takes for each runner to complete one mile. It is a measure of their speed, with a lower unit rate indicating a faster pace. Josiah takes 5.5 minutes to run one mile, and Elena takes 5.25 minutes to run one mile. This means that Elena runs at a slightly faster pace per mile compared to Josiah.