What was sebastian kawa's average speed with Diana 2?
CREATE TABLE "race_4_5_01_2010" (
  "position" real,
  "pilot" text,
  "glider" text,
  "speed" text,
  "distance" text
);
SELECT "speed" FROM "race_4_5_01_2010" WHERE "glider"='diana 2' AND "pilot"='sebastian kawa';