CREATE TABLE table_2518 ("Year" TEXT, "Date" TEXT, "Driver" TEXT, "Team" TEXT, "Manufacturer" TEXT, "Laps" TEXT, "Miles  ( km ) " TEXT, "Race Time" TEXT, "Average Speed  ( mph ) " TEXT, "Report" TEXT)

What was the average speed for a racetime of 3:08:08?
SELECT "Average Speed (mph)" FROM table_2518 WHERE "Race Time" = '3:08:08'
SELECT "Average Speed (mph)" FROM "table_2518" WHERE "Race Time" = '3:08:08'