CREATE TABLE table_15317 ("Year" TEXT, "Start" TEXT, "Qual" TEXT, "Rank" TEXT, "Finish" TEXT, "Laps" FLOAT)

What is the finish with 51 laps?
SELECT "Finish" FROM table_15317 WHERE "Laps" = '51'
SELECT "Finish" FROM "table_15317" WHERE "Laps" = '51'