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exists and is an alternate of . It depends on the stroke and the distance, but using the fastest stroke over the shortest distance (freestyle over 100m), Phelps' record is 47.51 seconds. This equates to around 4.7 mph - brisk walking pace.
Below, I have taken several men's and women's world records and calculated the runners' average speed. Usain Bolt has averaged over 23 miles per hour in both the 100 and 200 meter events. It's interesting to note that the 60 meter race has a slower average speed for both men and women than the 100 meter race. This must be because accelerating at the start of a race takes some time. These world records were last updated on May 5, 2010.