Final answer:
To find out how many miles the Smith family traveled each hour on their vacation, divide the total distance of 319 miles by the total travel time of 5.5 hours, resulting in an average speed of approximately 58 miles per hour.
Step-by-step explanation:
To calculate the Smith family's average speed during their 5.5-hour vacation journey covering 319 miles, you divide the total distance traveled by the total time taken. This can be expressed using the formula for average speed, which is:
Average speed = Total distance ∕ Total time
Average speed = 319 miles ∕ 5.5 hoursApproximately 58 miles per hour
This means the Smith family traveled at an average speed of approximately 58 miles each hour during their vacation.