The fastest thoroughbreds average nearly 40mph! And an average thoroughbred runs about 36 mph.
The world record for a Thoroughbred racehorse's average speed over a mile is 43 miles per hour...but their spurts of speed can be slightly faster. Converted to kilometers per hour that equals 69.2km/h.
In the '73 Belmont, it was estimated that Secretariat hit 55 mph down the stretch.
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