text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_2923917_4 (melbourne VARCHAR, distance VARCHAR)
  ### Question:
  How many listings under Melbourne has a distance at 15km?
  ### Answer:
  SELECT COUNT(melbourne) FROM table_2923917_4 WHERE distance = "15km"