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.
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.
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