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That would mean both reached a speed of roughly 26.5 MPH. Considering that, even the reductions the WR has taken in the last 12 years, it would be okay to assume 27-28 MPH is the fastest speed ever attained by a person running. Though Bob Hayes, in 1964, ran his leg of the 4x100m relay in 8.50 seconds.
The World's Fastest Man Meets the World's Slowest Woman. In Beijing the focus has moved from the pool to the track, where Usain Bolt breezed through the 100-meter dash so easily he looked like an Olympian god running against mortals. No doubt he's now the world's fastest human. Another Olympian who held that title was Bullet Bob Hayes, who later played for the Dallas Cowboys. He was crowned world's fastest human at the 1964 Olympics in Tokyo where he won gold medals in the 100-meter dash and as anchor of the 400-meter relay. Like Bolt, Hayes blazed through the dash leaving his competitors in the dust.