Table schema:
CREATE TABLE table_name_15 (kilometer INTEGER, average_climb___percentage_ VARCHAR, name VARCHAR, pavement VARCHAR, length__m_ VARCHAR)

Question: What is the Kilometer of the Berendries asphalt course with an Average climb less than 7 and Length (m) longer than 645?
SQL: SELECT AVG(kilometer) FROM table_name_15 WHERE pavement = "asphalt" AND length__m_ > 645 AND name = "berendries" AND average_climb___percentage_ < 7