CREATE TABLE table_21917 ("Year" FLOAT, "Date" TEXT, "Driver" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Miles  ( km ) " TEXT, "Race Time" TEXT, "Average Speed  ( mph ) " TEXT)

What year was the winning race time 1:55:13?
SELECT MAX("Year") FROM table_21917 WHERE "Race Time" = '1:55:13'
SELECT MAX("Year") FROM "table_21917" WHERE "Race Time" = '1:55:13'