A project comprises the activities shown in the table, which also shows the duration of the activities.

$\backslash$table$[[$Activity$,$Preceding activity,Duration $($hours$)],[$A$,-,5],[$B$,-,14],[$C$,$A$,$ B$,17],[$D$,$C$,7],[$E$,$C$,14],[$F$,$D$,6],[$G$,$F$,3],[$H$,$E$,9]]$

$($a$)$ Construst the network dianram for the nrnient

$($b$)$ The critical path from the project is $B,C,E,H$

$($c$)$ Expected completion time is $$ hours.