CREATE TABLE "table1_2101431_1" (
  "episode" text,
  "broadcast_date" text,
  "run_time" text,
  "viewers_in_millions" text,
  "archive" text
);

Question: How many millions viewers watched the episode that ran 23:25?
SQL: SELECT "viewers_in_millions" FROM "table1_2101431_1" WHERE "run_time"='23:25';

Question: What is the broadcast date of the episode on 16mm t/r that ran 23:25?
SQL: SELECT "broadcast_date" FROM "table1_2101431_1" WHERE "archive"='16mm t/r' AND "run_time"='23:25';

Question: Which episode was watched by 7.2 million viewers?
SQL: SELECT "episode" FROM "table1_2101431_1" WHERE "viewers_in_millions"='7.2';

Question: What episode had a run time of 24:18?
SQL: SELECT "episode" FROM "table1_2101431_1" WHERE "run_time"='24:18';