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:
| Place | Rider | Country | Machine | Speed | Time | Points |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Chas Mortimer | United Kingdom | Yamaha | 87.49mph | 1:17.38.2 | 15.0 |
| 2.0 | Charlie Williams | United Kingdom | Yamaha | 80.49mph | 1:24.23.0 | 12.0 |
| 3.0 | Billy Rae | United Kingdom | Maico | 79.29mph | 1:25.39.8 | 10.0 |
| 4.0 | Lindsay Porter | United Kingdom | Honda | 78.63mph | 1:26.30.0 | 8.0 |
| 5.0 | Ron Hackett | United Kingdom | Honda | 76.55mph | 1:28.44.0 | 6.0 |
| 6.0 | Ralph Watts | United Kingdom | Honda | 76.40mph | 1:28.54.0 | 5.0 |
| 7.0 | Fred Launchbury | United Kingdom | Maico | 75.75mph | 1:29.40.60 | 4.0 |
| 8.0 | Leigh Notman | United Kingdom | Yamaha | 75.74mph | 1:29.41.40 | 3.0 |
| 9.0 | A.Morris | United Kingdom | Yamaha | 75.70mph | 1:29.43.60 | 2.0 |
| 10.0 | M.Evans | United Kingdom | Yamaha | 75.23mph | 1:30.17.40 | 1.0 |
Question:
What is Time, when Speed is 87.49mph?
Answer:
1:17.38.2