The fastest human footspeed on record is 44.64 km/h (12.4 m/s or 27.8 mph), seen during the final 100 meters sprint of the World Championships in Berlin on 16 August 2009 by Usain Bolt (average speed between the 60th and the 80th meter, which he covered in 1.61 seconds).

Maximum human sprint speed is strikingly slower than that of many animals. Compared to other land animals, humans are exceptionally capable of endurance, but exceptionally incapable of great speed. For example, cheetahs can attain short bursts of speed well over 100 km/h (62 mph), the American quarter horse has topped 88 km/h (55 mph), greyhounds can reach 70 km/h (43 mph), and the Mongolian Wild Ass has been measured at 64 km/h (40 mph).

Even the domestic cat may reach 48 km/h (30 mph). An example would be the Man versus Horse Marathon, where horses with saddle and rider have bested almost all runners often by more than 25%.

More Info: wikipedia.en.com