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:
| Year | Start | Qual | Rank | Finish | Laps |
| --- | --- | --- | --- | --- | --- |
| 1951 | 18 | 133.839 | 13 | 28 | 30.0 |
| 1952 | 9 | 136.617 | 6 | 9 | 200.0 |
| 1956 | 30 | 141.471 | 24 | 10 | 199.0 |
| 1961 | 30 | 145.038 | 19 | 24 | 55.0 |
| Totals | Totals | Totals | Totals | Totals | 484.0 |
Question:
What is the lap number for the rank of 13?
Answer:
30.0