Question: Which nationality has a time of 50.92?
SQL: SELECT "Nationality" FROM "2-18624808-5" WHERE "Time" = 50.92;

Question: What is the time with fewer than 5 lanes for the United States?
SQL: SELECT SUM("Time") FROM "2-18624808-5" WHERE "Lane" < 5.0 AND "Nationality" = 'United States';