I once ran a mile in under 4 minutes, can you bet that? The history of the mile run event began in England, 
The best I can do is in grade school I ran a 7 minute mile. How did you train to get so fast?
I practice every morning, that was how I trained myself,  In spite of the roughly equivalent 1500 metres race, the mile run is present in all fields of athletics
Do you know when it started to be ran as an athletic event?
Oh yes, the history of the mile run began in England and it initially found usage within the wagered running contests of the 18th and 19th century.
I thought England used the Kilometer not the mile? Why do they run the mile if they use another measure of distance?
Don't really know, but distance of the English mile gained its current definition of 1,760 yards through a statute of the Parliament of England in 1593.