CREATE TABLE table_51401 ("Year" TEXT, "Start" TEXT, "Qual" TEXT, "Rank" TEXT, "Finish" TEXT, "Laps" FLOAT)

What's the lowest amount of laps with a start of 21?
SELECT MIN("Laps") FROM table_51401 WHERE "Start" = '21'
SELECT MIN("Laps") FROM "table_51401" WHERE "Start" = '21'