never really heard of a 1800 yard sprint; but if you are serious; an idea i have would be to begin running 2000 yards at a good slow pace; gradually working up to faster in time..
First of all you dont train, you cant train and you will not train... you will be Kate. You walk like Kate, talk like Kate, you become Kate then and only then will you be able to reach the potential...
I'm not sure they keep records of 100 yard sprints as it's not an athletic event. But there is a world record for the 100m sprint. 9.74 seconds was ran by Asafa Powell.