How many listings under Melbourne has a distance at 15km?
CREATE TABLE table_2923917_4 (melbourne VARCHAR, distance VARCHAR)
SELECT COUNT(melbourne) FROM table_2923917_4 WHERE distance = "15km"
### 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"