user: ### NOW ANSWER:
Question: What is the average Position, when Speed is "143.5km/h"?
Columns: ['Position', 'Pilot', 'Glider', 'Speed', 'Distance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Mario Kiessling', 'Ventus 2ax', '160.6km/h', '319.7km']
SQL:

assistant: SELECT AVG("Position") FROM "Table" WHERE "Speed" = '143.5km/h';