Final answer:
Hector is walking at a rate of 0.1 miles per minute.
Step-by-step explanation:
To find the rate at which Hector is walking, we can calculate the distance he walked in 30 minutes. Given that he walked 3 miles in 30 minutes, we can divide the total distance by the total time: 3 miles / 30 minutes = 0.1 miles per minute. This means Hector is walking at a rate of 0.1 miles per minute.