Task time estimates for the modification of an assembly line at Jim Goodale's Carbondale, Illinois, factory are as follow

Activity

Time $($in hours$)$

Immediate Predecessors$)$

$6\mathrm{.}0$

$7\mathrm{.}2$

ASSCi

$4\mathrm{.}0$

$8\mathrm{.}0$

$,$

$4\mathrm{.}8$

$,$

F

$8\mathrm{.}4$

D

G

$6\mathrm{.}0$

E$,$