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An airplane is flying horizontally at 720 miles/hr, 3 miles above the ground, when it passes an observer on the ground. How fast is the

An airplane is flying horizontally at 720 miles/hr, 3 miles above the ground, when it passes an observer on the ground. How fast is the distance between the person and the plane increasing 10 seconds later?

A. About 700 miles/hr
B. About 400 miles/hr
C. About 500 miles/hr
D. About 600 miles/hr

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