Can you show where you are lost? That would help a lot. Also, since this is a problem in a subject other than math, it would help if you told us something of the context and what things mean.
I think the "conversion" is something that is causing the amount of glucose to decrease by 6 grams per second. You are told that 180 grams of glucose is one mole. But what is "mM/s"? I was thinking maybe millimoles per second, but the symbol for mole is mol, not M, right?
OK, I looked it up and found that M stands for molar, which is moles per liter.
So you want to convert grams/sec (per milliliter) to millimoles/liter/second. That amounts to converting g/mL to mmol/L.
Is that what you needed help with, or did you get that far, and not know how to do it? Please show whatever work you can (even if you know it's wrong), so we can see where you need help, and how close you are to getting it right.