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:
| Lines | Opening | Traction | Length | Stations | Route | Stops | Travel time |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Naples – Baiano | 1885.0 | Electric | 38 km | 28.0 | Porta Nolana - Nola - Baiano | 28.0 | 59 minutes |
| Naples – Sarno | 1891.0 | Electric | 38 km | 28.0 | Porta Nolana - Ottaviano- Sarno | 28.0 | 65 minutes |
| Naples – Poggiomarino | 1904.0 | Electric | 35 km | 25.0 | Porta Nolana -Scafati - Poggiomarino | 25.0 | 57 minutes |
| Naples – Sorrento | 1932.0 | Electric | 47 km | 36.0 | Porta Nolana - Torre Annunziata - Sorrento | 36.0 | 68 minutes |
| Branch Botteghelle – San Giorgio | 2001.0 | Electric | 8 km | 7.0 | Porta Nolana - Centro Direzionale - San Giorgio | 11.0 | 15 minutes |
Question:
Name the number of stations for 15 minutes travel time
Answer:
1.0