$3\mathrm{.}6$

Shirley Hopkins is developing a program in leadership training for middle$-$level managers. Shirley has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors, and times appear in the accompanying table:

$\backslash$table$[[$Activity$,$Immediate Predecessor,Time $($days$)],[$A$,--,2],[$B$,--,5],[$C$,---,1],[$D$,$B$,10],[$E$,$A$,$ D$,3],[$F$,$C$,6],[$G$,$E$,$ F$,8]]$