human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Rider, Manufacturer, Laps, Time/Retired, Grid
###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?
gpt
SELECT AVG Laps FROM table WHERE Time/Retired = +28.108 AND Grid > 11