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_2665085_1 (length__ft_ VARCHAR, speed__mph_ VARCHAR)
### Question:
What is the length of the coaster with the unknown speed
### Answer:
SELECT length__ft_ FROM table_2665085_1 WHERE speed__mph_ = "unknown"