CREATE TABLE table_name_23 (avg_speed VARCHAR, distance VARCHAR, winning_driver VARCHAR)

What was the average speed over 18.00km for winning driver Jean-Claude Andruet?
SELECT avg_speed FROM table_name_23 WHERE distance = "18.00km" AND winning_driver = "jean-claude andruet"
SELECT "avg_speed" FROM "table_name_23" WHERE "18.00km" = "distance" AND "jean-claude andruet" = "winning_driver"