43.18, set at the 1999 Seville world championships by Michael Johnson.
Bolt has run 45.28s for 400m.
Michael Johnson could run 400m (about a few meters shorter that a quarter mile) faster than anyone else.
48 something
The fastest time a person has run a 1400 meter race is 3 minutes 43.13 seconds. Moroccan athlete Hicham el Guerrouj ran it in 2011.
Fastest person runs about 20.3 miles which is Usain Bolt.
Well with proper hurdle technique you should be able to maintain a 1:03 or 1:04. Considering your probably a beginner I would expect your time to be a 1:09, 10 seconds slower than your 400m time.
Scarlet Fox
There is no way to categorize someone as being the fastest because of all the different distances that can be run. But the person who holds in the record time in the 100m is Florence Griffith Joyner.
Train really hard and start off medium and then start getting faster as 400m is not that far to run ALL RIGHT.
Usain Bolt
I don't know about the record, but I run the 400m for high school track. My PR is 63 seconds, but there are other girls on my 4 x 4 team who run 56's and they broke the school record. To get anywhere near a scholarship, you have to run at least a 57 for the 400m. It sounds easy but don't under estimate it until you try to run that time.
Kignston summer 2012 400m in 45.86 secs