CREATE TABLE table_name_43 (heat INT, lane VARCHAR, country VARCHAR, mark VARCHAR)

What is the lowest heat for the United states with a mark of 51.85 pb and lane higher than 6?
SELECT MIN(heat) FROM table_name_43 WHERE country = "united states" AND mark = "51.85 pb" AND lane > 6
SELECT MIN("heat") FROM "table_name_43" WHERE "51.85 pb" = "mark" AND "country" = "united states" AND "lane" > 6