Question: What is the average speed for ships before 1974 with over 1.73 passengers?
SQL: SELECT AVG("Speed") FROM "2-11570929-1" WHERE "Year" < 1974.0 AND "Passengers" > 1.73;

Question: How many vessels are named aqua jewel?
SQL: SELECT COUNT("Vessels") FROM "2-11570929-1" WHERE "Ship name" = 'aqua jewel';