Determine the project's duration if the time for activity C is $5,$ for activity D is $8,$ and for activity F is $6.$

All activity times are in weeks.

Code

Prec.

Time

$5$

A $-$

$7$

$?$

D

B$,$

$?$

E

$5$

F

C$,$ E

$?$

a$.24$

$$ b$.19$

C$.20$

d: $17$