CREATE TABLE table_name_15 (kilometer INTEGER, average_climb___percentage_ VARCHAR(255), name VARCHAR(255), pavement VARCHAR(255), length__m_ VARCHAR(255))
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