Thank you for helping! I got it :)
The sign would normally imply a direction but it's not clear to me which direction the problem statement considers to be +ve. It could be east or west for example.
Is that the problem statement as written? If it is then I think it's badly worded but I would take +ve to be north because it says "[+]28.5Km north of jollitown".
That would mean a negative velocity would be heading south.
Separate names with a comma.