Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
for the rank of 3 for the united states, what is the average lane?

### Inputs:
table_name: table, columns: ['Rank', 'Lane', 'Name', 'Nationality', 'Time']

### Response:
SELECT AVG Lane FROM table WHERE Nationality = united states AND Rank = 3