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_name_31 (speed INTEGER, year VARCHAR, passengers VARCHAR)
### Question:
What is the average speed for ships before 1974 with over 1.73 passengers?
### Answer:
SELECT AVG(speed) FROM table_name_31 WHERE year < 1974 AND passengers > 1.73