What is the time of the game after week 4 against the Baltimore Ravens?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "location" text,
  "time_et" text,
  "result" text,
  "record" text
);
SELECT "time_et" FROM "schedule" WHERE "week">4 AND "opponent"='baltimore ravens';