Question: Who was in Lane 5 and had a heat of 7?
SQL: SELECT "Name" FROM "2-18624643-3" WHERE "Heat" = 7.0 AND "Lane" = 5.0;

Question: What lane number was hungary and had a heat of 4?
SQL: SELECT COUNT("Lane") FROM "2-18624643-3" WHERE "Heat" = 4.0 AND "Nationality" = 'hungary';