Question: Draw contour lines for the location problem described in Problem.
Problem: Armand Bender plans to visit six customers in Manhattan. Three are located in a building at 34th Street and 7th Avenue. The remaining customers are at 48th and 8th, 38th and 3rd, and 42nd and 5th. Streets are separated by 200 feet and avenues by 400 feet. He plans to park once and walk to all of the customers. Assume that he must return to his car after each visit to pick up different samples. At what location should he park in order to minimize the total distance traveled to the clients?