I'm not sure what you mean by "15km9". This doesn't appear to be a standard notation or complete thought. Could you please provide more context or clarify what you're trying to ask or express? Are you referring to:

1. A distance of 15 kilometers?

2. A measurement like 15 km/h (kilometers per hour)?

3. Something else entirely?

If you can give me more information, I'll be happy to help you with whatever you need.