Please explain properly Thanks!

Use the precedence diagram above. The cycle time is 78 seconds. The layout is: WS \#1 - AC, WS \#2 - BD, WS \#3 - FEG, WS \#4 - H, WS \#5 - J What would be the idle time for this line? \begin{tabular}{l} \hline 104 \\ \hline 56 \\ \hline 82 \\ \hline 119 \\ \hline 105 \\ \hline 175 \end{tabular}