CREATE TABLE table_65937 ("Time" TEXT, "Athlete" TEXT, "Nationality" TEXT, "Location of race" TEXT, "Date" TEXT)

What's the nationality of Henry Carr having a time of 20.3y?
SELECT "Nationality" FROM table_65937 WHERE "Athlete" = 'henry carr' AND "Time" = '20.3y'
SELECT "Nationality" FROM "table_65937" WHERE "Athlete" = 'henry carr' AND "Time" = '20.3y'