user: ### NOW ANSWER:
Question: Which Date has a Length of feet 9inches (m), and a Builder of Portland Terminal Company?
Columns: ['Number', 'Builder', 'Type', 'Date', 'Length', 'Capacity']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['10', 'Laconia Car Company', 'baggage car', 1882.0, 'feet (m)', 'no seats']
SQL:

assistant: SELECT AVG("Date") FROM "Table" WHERE "Length" = 'feet 9inches (m)' AND "Builder" = 'Portland Terminal Company';