The speed of a horse is typically measured in miles per hour (mph) or kilometers per hour (kph). To compare the speed of different horses, you can use a stopwatch to time how long it takes each horse to cover a specific distance, such as a furlong (1/8th of a mile). The formula for speed is distance divided by time. Keep in mind that factors like track conditions, rider skill, and the horse's fitness can affect speed. Professional races often provide official times for accurate comparisons.

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