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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.
The fastest time for running 100 m is about 9.8 s. So, someone running that fast would have run 100/9.8 m/s, or about 10.2 m/s, which is about 36.7 km/h. After taking acceleration into account, I would guess that the world's fastest person could run about 38-39 km/h. aaron_189 Â· 1 decade ago.