CREATE TABLE table_name_31 (speed INT, year VARCHAR, passengers VARCHAR)

What is the average speed for ships before 1974 with over 1.73 passengers?
SELECT AVG(speed) FROM table_name_31 WHERE year < 1974 AND passengers > 1.73
SELECT AVG("speed") FROM "table_name_31" WHERE "passengers" > 1.73 AND "year" < 1974