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Car A drives west at a speed of 30 km/hr starting from a McDonald's. 20 minutes later, Car B starts driving west at a

Car A drives west at a speed of 30 km/hr starting from a McDonald's. 20 minutes later, Car B starts driving west at a speed of 35 km/hr from a location 50 kilometers directly north of the same McDonald's. How quickly (i.e., with respect to time) is the distance between Cars A and B changing 20 minutes after Car B started driving?

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