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 | Rider | Team | Speed | Time |
| --- | --- | --- | --- | --- |
| 1.0 | Dan Kneen | 400cc Honda | 95.517mph | 46' 54.48 |
| 2.0 | Ian Whitlow | 650cc Suzuki | 91.911mph | 49' 15.64 |
| 3.0 | Colin Martin | 400cc Honda | 91.065mph | 49' 43.09 |
| 4.0 | Derek Costello | 400cc Honda | 89.673mph | 50' 29.41 |
| 5.0 | Dave Walsh | 650cc Suzuki | 88.760mph | 51' 00.56 |
| 6.0 | Darren Gilpin | 650cc Suzuki | 88.042mph | 53' 52.39 |
Question:
What is the lowest rank of rider darren gilpin?
Answer:
6.0