user: Question: What was Johnny Rutherford's fastest lap while Al Unser was the pole position?
Columns: ['Rd', 'Name', 'Pole Position', 'Fastest Lap', 'Winning driver', 'Winning team', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Datsun Twin 200', 'Johnny Rutherford', 'Unknown', 'Johnny Rutherford', 'Chaparral', 'Report']
SQL:

assistant: SELECT "Fastest Lap" FROM "Table" WHERE "Winning driver" = 'Johnny Rutherford' AND "Pole Position" = 'Al Unser';