What is the distance of the races of the triple crown?

1) Kentucky Derby: 1 1/4 miles (on a 1 mile oval track)

2) Preakness Stakes: 1 3/16 miles (on a 1 mile oval track)

3) Belmont Stakes: 1 1/2 miles (on a 1 1/2 mile oval track, the longest dirt oval in America)

Secretariat holds the world dirt course record for 1 1/2 miles, which he earned by winning the Belmont Stakes (by 31 lengths) and the Triple Crown in 1973. He still holds the record by 2 full seconds over the next fastest Belmont stakes time.