A policeman is 3/10 of a mile from a road. His radar indicates that the car is moving away at a speed of 64 miles per hour when the car is 4/10 of a mile down the road. How fast is the car traveling?

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A policeman is 310 of a mile from a road His radar indicates that the car is moving away at a speed of 64 miles per hour when the car is 410 of a mile down the class=
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