user: Question: What's the lowest capacity when the margin is 03:30?
Columns: ['Driver', 'Navigator', 'Vehicle', 'Class', 'Capacity', 'Total Time', 'Margin']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Griffiths', 'Griffiths', '1989 Nissan Skyline GTS-t', 'AM32', 3397.0, '14:09', '00:00']
SQL:

assistant: SELECT MIN("Capacity") FROM "Table" WHERE "Margin" = '03:30';