For a 17 year old boy, the average 400m is anywhere from 54-51 seconds. For a 17 year old girl, there really is no average time because an individual's time can fluctuate anywhere from 73-59 seconds. It pretty much depends on your body type and how experienced you are with the race. Hope that helps :)
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I run a 22.5, but honestly, anything in the low 23's is faster than the majority of people can run. I ran at a national level track meet (The Great Southwest) and the top kids were running 20.8's, dudes nuts.
A really good 100m dash time for a 17 year old would be anything faster than an 11.5