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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.
His top speed in the 100m race was 43.93 km/h or 27.3 mph. At the 2009 World Championships in Berlin, Bolt ran between the 60 and 80 meter marks in only 1.61 seconds which corresponds to a maximum velocity of 44.72 kilometers an hour. 23.2mph is his average speed over the 200m. That means he started at 0 mph and he got at some point to his top speed which is unknown and 23.2mph is his average. His top speed in the 100m race was 43.93 km/h or 27.3 mph.