a. A plane flying horizontally at an altitude of 2 miles 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 5 miles away from the station. (Round your answer to the nearest whole number.)

a. A plane flying horizontally at an altitude of 2 miles 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 5 miles away from the station. (Round your answer to the nearest whole number.)

b. Two cars start moving from the same point. One travels south at 48 mi/h and the other travels west at 20 mi/h. At what rate (in mi/h) is the distance between the cars increasing three hours later?