CREATE TABLE table_73420 ("Year" FLOAT, "Date" TEXT, "Driver" TEXT, "Team" TEXT, "Manufacturer" TEXT, "Laps" TEXT, "Miles  ( km ) " TEXT, "Race Time" TEXT, "Average Speed  ( mph ) " TEXT, "Report" TEXT)

How many miles were driven in the race where the winner finished in 2:47:11?
SELECT "Miles (km)" FROM table_73420 WHERE "Race Time" = '2:47:11'
SELECT "Miles (km)" FROM "table_73420" WHERE "Race Time" = '2:47:11'