Mary is driving a car around a circular racetrack, which has a diameter of six miles. It takes her a half hour to make one full

Question

Mary is driving a car around a circular racetrack, which has a diameter of six miles. It takes her a half hour to make one full revolution around the track. 
If Mary is not speeding up or slowing down, what is Mary's instantanious speed? 
What is Mary's average speed?

Kunduz · Accepted Answer

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