some of parameters are constant in advance as shown in Table 1. Also, it is assumed that the fleet
has three types of capacities as small (20 persons), medium (30 persons), and large (40 persons) sizes. The
parameter c can be variable in terms of hour. The distance between nodes is randomly generated at uniform
in interval [1,10] in terms of kilometer (km). The CPU times are correspond to an intel Celeron mobile
1.3 GHz processor