DISTANCE BETWEEN MOVING OBJECTS A truck is 300 miles due east of a car and is traveling west at the constant speed of 30 miles per hour. Meanwhile, the car is going north at the constant speed of 60 miles per hour. At what time will the car and truck be closest to each other? [Hint:You will simplify the calculation if you minimize the square of the distance between the car and truck rather than the distance itself. Can you explain why this simplification is justified?]
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