How fast did he run? Well, 100 meters in 9.69 seconds translates to 100/9.69 = 10.32 meters per second. In more familiar units, that’s about 37 kilometers per hour, or 23 miles per hour. But that was his average speed over the whole race. He went slower than that at the beginning and end and faster than that in the middle. More detailed information is available from his split times recorded every 10 meters down the track. He covered the first 10 meters in 1.83 seconds, corresponding to an average speed of 5.46 meters per second there. His fastest splits occurred at 50 to 60 meters, 60 to 70
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