Which Combined elapsed time has a Skipper of stephen wilkins?
CREATE TABLE "bt_global_challenge_2000_1" (
  "overall_place" text,
  "yacht_name" text,
  "skipper" text,
  "points" text,
  "combined_elapsed_time" text
);
SELECT "combined_elapsed_time" FROM "bt_global_challenge_2000_1" WHERE "skipper"='stephen wilkins';