user: ### NOW ANSWER:
Question: What's the lowest rank of the United States with a time less than 24.63?
Columns: ['Rank', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'real']
Sample row: [1.0, 3.0, 'Britta Steffen', 'Germany', 24.43]
SQL:

assistant: SELECT MIN("Rank") FROM "Table" WHERE "Nationality" = 'United States' AND "Time" < 24.63;