What was the highest amount of laps when the class was v8 and the entrant was diet-coke racing?
CREATE TABLE "results" (
  "pos" text,
  "class" text,
  "entrant" text,
  "drivers" text,
  "laps" real
);
SELECT MAX("laps") FROM "results" WHERE "class"='v8' AND "entrant"='diet-coke racing';