How long will the milk remain unspoiled at 20C?

Hello,

I have a question that I need to do for homework that I can not figure out how to do.

The contents will spoil in 8 days if stored at 5C. The contents will spoil in 12 hours if stored at 30C. If the mechanism and definition of spoilage remain constant in this temperature range, how long will the milk remain unspoiled at 20C?

I’m not looking for the answer, I want to know how to do the problem. The answer is 34.4 hours, but I can’t figure out how to start. I know it has to do with kinetics and reaction rate, but how do I approach this problem? How do I find the reaction rate in relation to temperature?

Thank you!