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 | Rowers | Country | Time | Notes |
| --- | --- | --- | --- | --- |
| 1.0 | Pedro Fraga , Nuno Mendes | Portugal | 6:39.07 | SA/B |
| 2.0 | Eyder Batista , Yunior Perez | Cuba | 6:40.15 | SA/B |
| 3.0 | Kazushige Ura , Daisaku Takeda | Japan | 6:43.03 | SC/D |
| 4.0 | Zsolt Hirling , Tamás Varga | Hungary | 6:50.48 | SC/D |
| 5.0 | Devender Kumar Khandwal , Manjeet Singh | India | 7:02.06 | SC/D |
| 6.0 | Jang Kang-Eun , Kim Hong-Kyun | South Korea | 7:12.17 | SC/D |
Question:
What is the highest rank with the notes of sa/b, and a time of 6:39.07?
Answer:
1.0