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The fourtrax will top out at about 55MPH.    Actually a stock fourtrax 250x runs at a top speed of 62, but with slight mods can increase the speeds to well over 75. Answer   it depends what has been done to it but a normal cr125r would go 60 to70 mph they cant go too fast because a cr450 goes 80mph to 100mph.
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.