user: Question: for the rank of 3 for the United States, what is the average lane?
Columns: ['Rank', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'real']
Sample row: [1.0, 4.0, 'Pieter van den Hoogenband', 'Netherlands', 47.84]
SQL:

assistant: SELECT AVG("Lane") FROM "Table" WHERE "Nationality" = 'United States' AND "Rank" = 3.0;