What is the average Position, when Speed is "143.5km/h"?
CREATE TABLE "race_1_2_01_2010" (
  "position" real,
  "pilot" text,
  "glider" text,
  "speed" text,
  "distance" text
);
SELECT AVG("position") FROM "race_1_2_01_2010" WHERE "speed"='143.5km/h';