How many trains depart at 17:30?
CREATE TABLE "important_trains_passing_from_kanpur_ana" (
  "train_no" real,
  "train_name" text,
  "arrival" text,
  "departure" text,
  "days" text,
  "platform_no" text
);
SELECT COUNT("train_no") FROM "important_trains_passing_from_kanpur_ana" WHERE "departure"='17:30';