Donovan Bailey's top speed was 43.6 km/h. This is a remarkable feat, as it is the fastest speed ever recorded by a human being. Bailey achieved this speed in 1996, when he won the Olympic gold medal in the 100-meter dash. His time of 9.84 seconds is still the world record for the 100-meter dash.
Donovan Bailey Smarty-Pants Showdown: 30 Questions to prove your intelligence