Assembly-Line Balancing Problem-Table 1 Below
the Florida Appliance Company Is

Assembly-Line Balancing Problem-Table 1 below
The Florida Appliance Company is installing an assembly line to produce vacuum cleaners, and Patrick, as an operations manager, is responsible for balancing the line. The work elements to be performed are listed, along with their items and immediate predecessors.
$\begin{array}{|l|l|l|}\hline\text { Work } && \text { Immediate } \\ \text { Element } & \text { Time }(s e c) & \text { Predecessor (s) }\\\hline\text { A } & 60 & -- \\B & 40 & \text { A } \\\text { C } & 30 & \text { B } \\\text { D } & 20 & \text { B } \\\text { E } & 40 & \text { B } \\\text { F } & 60 & \text { C } \\G & 70 & \text { D } \\H & 50 & \text { F, G } \\\text { I } & 20 & \text { E } \\J & 60 & \text { H, I }\\\hline\end{array}$
-Use the information in Table 1. Total idle time is _____ seconds using the longest-task-time rule.

A) 10
B) 15
C) 30
D) 25