Final answer:
To find the unit rate, divide the distance traveled by the time taken. In this case, the horse travels 31 miles in 1 hour, so the horse's speed is 31 miles per hour.
Step-by-step explanation:
To find the unit rate, divide the distance traveled by the time taken. In this case, the horse travels 31 miles in 1 hour, so the speed can be found by dividing 31 by 1.
Speed (miles per hour) = Distance (miles) ÷ Time (hours)
Therefore, the horse's speed is 31 miles per hour.
Learn more about Unit rates involving ratios of fractions