CREATE TABLE table_51109 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

Name the Time which has a Manufacturer of aprilia, and a Grid smaller than 16, and a Rider of sandro cortese?
SELECT "Time" FROM table_51109 WHERE "Manufacturer" = 'aprilia' AND "Grid" < '16' AND "Rider" = 'sandro cortese'
SELECT "Time" FROM "table_51109" WHERE "Grid" < '16' AND "Manufacturer" = 'aprilia' AND "Rider" = 'sandro cortese'