user: Question: What was the average amount of laps for competitors with a grid that was more than 11 and a Time/Retired of +28.108?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Casey Stoner', 'Ducati', 22.0, '44:12.891', 4.0]
SQL:

assistant: SELECT AVG("Laps") FROM "Table" WHERE "Time/Retired" = '+28.108' AND "Grid" > 11.0;