CREATE TABLE table_name_13 (class VARCHAR, race VARCHAR, length VARCHAR)

What is the class of the Budweiser Grand Prix of Miami race with a length of 3 hours?
SELECT class FROM table_name_13 WHERE race = "budweiser grand prix of miami" AND length = "3 hours"
SELECT "class" FROM "table_name_13" WHERE "3 hours" = "length" AND "budweiser grand prix of miami" = "race"