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Usain Bolt, the Jamaican Olympiad, set the world record, running at a top speed of 27 (mph) He kept that speed though mostly the entire race, except the beginning start off, so i would say around 22-25 (mph) average , to get the exact answer you are looking for, you would have to do the math.

The average speed during that dash is 100/9.88 = 10.1215 meters per second (rounded)

( 36.437 km per hr )

( 22.641 mph )

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Q: What is the average speed of an olympic runner that runs 100 m in 9.88 seconds?
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