What is the length of the coaster with the unknown speed
CREATE TABLE table_2665085_1 (
    length__ft_ VARCHAR,
    speed__mph_ VARCHAR
)
SELECT length__ft_ FROM table_2665085_1 WHERE speed__mph_ = "unknown"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the length of the coaster with the unknown speed ### Input: CREATE TABLE table_2665085_1 (
    length__ft_ VARCHAR,
    speed__mph_ VARCHAR
) ### Response: SELECT length__ft_ FROM table_2665085_1 WHERE speed__mph_ = "unknown"