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A plane flying horizontally at an altitude of 1 mi and a speed of 500 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 2 mi away from the station.

(a). What quantities are given in the problem?

(b). What is the unknown?

(c). Draw a picture of the situation for any time t.

(d). Write an equation that relates the quantities.

(e). Finish solving the problem.