A road perpendicular to a highway leads to a farmhouse located 8 mile away. An automobile traveling

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A road perpendicular to a highway leads to a farmhouse located 8 mile away. An automobile traveling on the highway passes through this intersection at a speed of 40mph.

How fast is the distance between the automobile and the farmhouse increasing when the automobile is 9 miles past the intersection of the highway and the road?

The distance between the automobile and the farmhouse is increasing at a rate of miles per hour.

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