text: 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_22 (max_speed__km_h_ INTEGER, quantity_built VARCHAR, year_built VARCHAR)
  ### Question:
  What is the max speed of the unit with an 8+4 quantity built before 1971?
  ### Answer:
  SELECT SUM(max_speed__km_h_) FROM table_name_22 WHERE quantity_built = "8+4" AND year_built < 1971