The average sprinting speed will range between 20-30km/h.
This means a person will be able to run the 100m in 12-20 seconds.
Elite runners will be able to run at a speed greater than 30km/h.
The current world record is set by Usain Bolt from Jamaica. He reached an average speed of 37.57km/h and top speed of 44km/h (27.8 mph) when setting the 100m world record. (Source)
Average human sprinting speed over 100m.
|100m time||Average speed (km/h)|
Something to consider.
In the 100m, athletes will typically reach their top speed around the 60m mark and then their bodies will start to decelerate in the latter part of the race due to fatigue.
Long jump athletes will usually have their top speed when they hit the board, which is usually 30-40m from the start of their run-up.
In the 2000 Olympics, there was a famous duel between Jai Taurima of Australia and Ivan Pedroso of Cuba, where they recorded top speeds at the take-off board between 38-42km/h. (Video source)