user: Question: What is the mean vertical relief in feet when the rank is more than 40 and the location is VA0573?
Columns: ['Rank', 'Park', 'Location', 'Peak Name', 'Elevation (ft)', 'Minimum Elevation (ft)', 'Vertical Relief (ft)']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'real']
Sample row: [1.0, 'Denali', 'AK0573', 'Mount McKinley', 20320.0, '240', 20080.0]
SQL:

assistant: SELECT AVG("Vertical Relief (ft)") FROM "Table" WHERE "Rank" > 40.0 AND "Location" = 'VA0573';