Table 921
Table 7 -Use the Information in Table 9

Table 9.21
Table 7.21 The following information is given about an assembly line.
The desired output rate is 90 units per hour.
$$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Work } \\\text { Element }\end{array} & \text { Time (sec) } & \begin{array} { c } \text { Immediate } \\\text { Predecessor } ( \mathrm { s } ) \end{array} \\\hline \mathrm { A } & 10 & - - \\\mathrm { B } & 6 & \mathrm {~A} \\\mathrm { C } & 15 & \mathrm {~A} \\\mathrm { D } & 20 & \mathrm {~B} \\\mathrm { E } & 12 & \mathrm {~B} \\\mathrm {~F} & 14 & \mathrm { C } , \mathrm { E } \\\mathrm { G } & 8 & \mathrm { D } \\\mathrm { H } & 20 & \mathrm {~F} , \mathrm { G } \\\hline\end{array}$$
-Use the information in Table 9.21.If you are using the longest work-element time rule,how many workstations do you need?

A) 2 stations
B) 3 stations
C) 4 stations
D) more than 4 stations