CREATE TABLE table_name_3 (date INT, length VARCHAR, builder VARCHAR)

Which Date has a Length of feet 9inches (m), and a Builder of portland terminal company?
SELECT AVG(date) FROM table_name_3 WHERE length = "feet 9inches (m)" AND builder = "portland terminal company"
SELECT AVG("date") FROM "table_name_3" WHERE "builder" = "portland terminal company" AND "feet 9inches (m)" = "length"