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rate of change should be (S(t2)-S(t1))/(t2-t1). unless there is something more complicated which I am missing. Replace the variables with what you have and see what you get. Hope it helps.
Cheap way to get to the answer if you understand what the problem asks for you is to look at what you have in units and see what units you need the answer to be at the end. In this case you know the speed, and you can find the circumference (i.e the
