What was the speed of the rider that earned 1 point?
CREATE TABLE "1971_isle_of_man_senior_tt_500cc_final_s" (
  "place" real,
  "rider" text,
  "country" text,
  "machine" text,
  "speed" text,
  "time" text,
  "points" real
);
SELECT "speed" FROM "1971_isle_of_man_senior_tt_500cc_final_s" WHERE "points"=1;