user: Question: What was the average speed for a racetime of 3:08:08?
Columns: ['Year', 'Date', 'Driver', 'Team', 'Manufacturer', 'Laps', 'Miles (km)', 'Race Time', 'Average Speed (mph)', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1998', 'March 1', 'Mark Martin', 'Roush Racing', 'Ford', '267', '400.5 (644.542)', '2:43:58', '146.554', 'Report']
SQL:

assistant: SELECT "Average Speed (mph)" FROM "Table" WHERE "Race Time" = '3:08:08';