CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "location" text,
  "time_et" text,
  "result" text,
  "record" text
);

Question: What time did the game featuring the Detroit Lions at Three Rivers Stadium occur?
SQL: SELECT "time_et" FROM "schedule" WHERE "location"='three rivers stadium' AND "opponent"='detroit lions';