Question: 7.(6 points) Two roads intersect at a right angle. At noon two cars are on the roads.- Car A is 3 miles to the west

7.(6 points) Two roads intersect at a right angle. At noon two cars are on the roads.- Car A is 3 miles to the west driving towards the intersection at a speed of 30 mph .- Car B is 4 miles to the south driving away from the intersection at speed of 20 mph .How fast is the distance between them changing at that time?

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