user: Question: What are the notes with the time 6:24.21?
Columns: ['Rank', 'Rowers', 'Country', 'Time', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Zac Purchase , Mark Hunter', 'Great Britain', '6:13.69', 'SA/B']
SQL:

assistant: SELECT "Notes" FROM "Table" WHERE "Time" = '6:24.21';