Name the most maidens when e.r. 5.11
CREATE TABLE "australia" (
  "name" text,
  "overs_bowled" text,
  "maidens" real,
  "runs_conceded" real,
  "wickets" real,
  "extras" real,
  "e_r" text
);
SELECT MAX("maidens") FROM "australia" WHERE "e_r"='5.11';