In a 25 meter swimming pool how many lengths do you have to swim to constitute a mile?

in a swim meet a mile is considered 1650yds and that is 66 lengths. Actually 1650 meters ~ 1 mile, not 1650 yards. There are 5280 feet in a mile, and 3 feet in a yard. 5280/3 = 1760 yards per mile. 25 yards per length, then 1760/25 = 70.4 lengths per mile. So in a 25 meter pool 66 legths = 1 mile. In a 25 yard pool 70.4 lengths = 1 mile.