The fastest record speed attained by a human on foot is 27.44 miles per hour. This speed was attained by Usain Bolt in the 100 yard dash.
Bob Hayes has the world record in the 100 yard dash. This record was set in the year 1963. This is a separate race from the 100 meter dash.
In 3.7 seconds and he is the fastest NFL running back.Overall he can outrun Chris johnson's time CJ runs his in a 2.24 that's fast too but not as fast as Rashard Mendenhall #34 for the Pittsburge Steelers.
100m race
According to several online sources, Bob Hayes' time in the 40 yard dash wasn't recorded. See The Fastest 40 Yard Dash Ever.
A hundred-meter race
What the hell is a fourth yard?!
The 220 yard race has been replaced with the 200 meter race although it is about 222 yards long; the 440 yard race has been replaced with the 400 meter race; and the 1,500 meter race has replaced the mile.
Chris Johnson
4.3
4.12 Fastest in History
4.23 was his fastest