CREATE TABLE table_57726 ("Year" FLOAT, "Race" TEXT, "Team" TEXT, "Pos." TEXT, "Co-driver" TEXT)

What position did Co-driver Jackie Oliver finish in the 24 hours of Le Mans?
SELECT "Pos." FROM table_57726 WHERE "Race" = '24 hours of le mans' AND "Co-driver" = 'jackie oliver'
SELECT "Pos." FROM "table_57726" WHERE "Co-driver" = 'jackie oliver' AND "Race" = '24 hours of le mans'