* "Sa va" is an informal way to say "How are you?" or "How's it going?"
* "Tu reste" means "You stay" or "You remain".
* "Quelle" is a feminine adjective meaning "which" or "what" in a question.
There are a few possibilities for what the speaker intended to say:
1. "Ça va, tu restes quelle heure?" - This would mean "How are you? What time are you staying?" This assumes "quelle" is meant to be "quelle heure" (what time).
2. "Ça va, tu restes à quelle heure?" - This would mean "How are you? At what time are you staying?" This is a slightly more formal version of the above.
3. "Ça va, tu restes avec quelle ?" - This would mean "How are you? Who are you staying with?" This assumes "quelle" refers to a person.
Without more context, it's difficult to determine the intended meaning.
It's always helpful to consider the surrounding conversation or situation to figure out the meaning of a sentence.