Bolt believes the world record in the 100 meters could be lowered to 9.4 seconds.
This site has looked at the technological possibilities for faster human speed.
He ran 100m final race in 9.58s, that gives average speed 10.4384 m/s (23.35mph). If he can go 100m in 9.4seconds that would give an average speed of 23.79 mph.
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