Two cars are approaching the intersection. One is 2 miles south of intersection and is moving at the constant speed of 10 miles per hour, at same time the other car is 5 miles east of intersection and is moving at the constant speed of 20 miles per hour. At t = 0, cars are 2 miles south and 5 miles east of intersection.
i) State distance d between cars as the function of time t?
ii) use the graphing utility to graph d = d(t). For what value of t its d smallest?