Final answer:
The constant speed was calculated by dividing the distance (25.6 miles) by the time (4 hours), which equals 6.4 miles per hour, making option A the correct answer.
Step-by-step explanation:
If it took 4 hours to walk 25.6 miles to your parents' house for Thanksgiving, to find your constant speed, you would divide the total distance by the total time.
Speed = Distance ÷ Time
So, your speed would be 25.6 miles ÷ 4 hours = 6.4 miles per hour.
This means the correct answer is A) 6.4 miles per hour.