Question: Two cars leave an intersection at the same time, one headed west and the other north. The westbound car is moving at 40 mph and

Two cars leave an intersection at the same time, one headed west and the other north. The westbound car is moving at 40 mph and the northbound car is moving at 50 mph. Fifteen minutes later, what is the rate of change in the perimeter of the right triangle created using the two cars and the intersection?

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