user: Question: What is the rank when the time is 6:50.48?
Columns: ['Rank', 'Rowers', 'Country', 'Time', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Pedro Fraga , Nuno Mendes', 'Portugal', '6:39.07', 'SA/B']
SQL:

assistant: SELECT "Rank" FROM "Table" WHERE "Time" = '6:50.48';