CREATE TABLE table_name_18 (height_metres___feet VARCHAR, rank VARCHAR, floors VARCHAR)

Which Height Metres / feet has a Rank of 8, and Floors of 3x17?
SELECT height_metres___feet FROM table_name_18 WHERE rank = 8 AND floors = "3x17"
SELECT "height_metres___feet" FROM "table_name_18" WHERE "3x17" = "floors" AND "rank" = 8