On paper : Consider a project with following precedence relationships and activity times.

$\backslash$table$[[$Activity$,$Immediate Predecessor,Activity Duration$],[$A$,-,5],[$B$,$A$,3],[$C$,$A$,4],[$D$,$B$,$ C$,3],[$E$,$D$,4],[$F$,$D$,7],[$G$,$E$,$ F$,4],[$H$,$G$,7]]$

a$.$ What is the Earliest Finish Time of the project?

b$.$ If the project should be completed in $25$ days, what is the slack for the project?

c$.$ Is the slack positive or negative? What does the slack value mean in this project?