Name the class 3 for silverstone rmit university
CREATE TABLE "winners" (
  "year" text,
  "location" text,
  "class_1" text,
  "best_uk_team" text,
  "class_1_200" text,
  "class_3" text,
  "class_1a" text
);
SELECT "class_3" FROM "winners" WHERE "location"='Silverstone' AND "class_1"='RMIT University';