Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Lane | Name | Nationality | Time |
| --- | --- | --- | --- | --- |
| 1.0 | 4.0 | Pieter van den Hoogenband | Netherlands | 47.84 |
| 2.0 | 5.0 | Lars Frölander | Sweden | 48.93 |
| 3.0 | 2.0 | Neil Walker | United States | 49.04 |
| 4.0 | 3.0 | Gary Hall, Jr. | United States | 49.13 |
| 5.0 | 6.0 | Chris Fydler | Australia | 49.55 |
| 6.0 | 8.0 | Attila Zubor | Hungary | 49.58 |
| 7.0 | 7.0 | Roland Mark Schoeman | South Africa | 49.84 |
| 8.0 | 1.0 | Gustavo Borges | Brazil | 49.93 |
Question:
for the rank of 3 for the united states, what is the average lane?
Answer:
2.0