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1st January 2011: As by end of 2010, the highest speed of human recorded was of 44.72 km/h (27.79 mph), seen during a 100 meters sprint (average speed between the 60th and the 80th meter) by Usain Bolt. The fastest speed of a human running was set by Maurice Greene, who achieved a sprint speed of 26.7 mph. Note that is anarobic : the highest sustained speed is just over 15 miles an hour - i.e. a 4 minute mile. So the first is the limit of the legs, the second the limit of the heart.
As of 20 August 2008, Usain Bolt is the the world's fastest man with a 200 meter sprint of 19.30 seconds, giving an average speed of 10.36 meters per second. There are 1609.344 meters in a mile, so 10.36 m/s / 1609.344 m/mi = 0.0064374 miles/second. There are 3600 seconds in an hour, so 0.0064374 mi/s * 3600 s/hr = 23.175 miles/hour. Usain Bolt clocked an *average* speed of 23.175 mph during his world record run, however he may have achieved speeds of 23-27 mph in the early part of the sprint.