CREATE TABLE "1970_isle_of_man_production_750_cc_tt_fi" (
  "rank" real,
  "rider" text,
  "team" text,
  "speed" text,
  "time" text
);

Question: What is the average speed of rider Peter Williams?
SQL: SELECT "speed" FROM "1970_isle_of_man_production_750_cc_tt_fi" WHERE "rider"='peter williams';

Question: What is the time/s of team Triumph in those races in which Triumph ranked higher than 4?
SQL: SELECT "time" FROM "1970_isle_of_man_production_750_cc_tt_fi" WHERE "team"='triumph' AND "rank"<4;