Abus 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?