$24$activities are:

$\backslash$table$[[$Performance$,,$Performance,$],[$Task$,$Time $($mins$),$Predecessors,Task,Time $($mins$),$Predecessors$],[$A$,4,-,$G$,5,$F$],[$B$,6,-,$H$,7,$D$,$ E$],[$C$,8,$A$,$I,$1,$H$],[$D$,7,$A$,$ B$,$J$,9,$E$],[$E$,3,$B$,$K$,1,$G$,$ I, J$],[$F$,4,$C$,,,]]$

This exercise only contains parts $b,c,d,e,f,$ and $g.$

b$)$ For the given daily $(24-$hour$)$ production rate of $120$ units, the highest allowable cycle time $=$ minutes $($enter your response as a whole number$).$