Graphs and Networks Engineers decided to pump water from a central tank in each block of houses in the residential infrastructure. The pump and the eight houses in Zone 1 are shown as vertices in the given network diagram. The number of edges joining the vertices give the shortest distances, in metres, between locations. B 40 C 70 50 70 90 40 A 80 80 Pump 120 E 70 90 40 50 80 F