A bus travels between the two cities A and B , which are 100 miles apart. If the bus has a breakdown, the distance from the breakdown to city A has a uniform distribution over (0, 100). There is a bus service station in city A , in B , and in the center of the route between A and B . It is suggested that it would be more efficient to have the three stations located 25, 50, and 75 miles, respectively, from A . Do you agree? Why?