I dont know how fast at full speed but I know that the world record for the Mile Run is 3.46 at an average of 27 mph (said the WGR book I think)
Usain Bolt ran 42mph
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Usain Bolt ran the 100 meter dash in 9.58 seconds in 2009. That is an average of 23.35 mph. His top speed was just over 27 mph.
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