CREATE TABLE table_78508 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What was the average amount of laps for competitors with a grid that was more than 11 and a Time/Retired of +28.108?
SELECT AVG("Laps") FROM table_78508 WHERE "Time/Retired" = '+28.108' AND "Grid" > '11'
SELECT AVG("Laps") FROM "table_78508" WHERE "Grid" > '11' AND "Time/Retired" = '+28.108'