A Company Is Designing a Product Layout for a New

Multiple Choice

A company is designing a product layout for a new product. It plans to use this production line eight hours a day in order to meet projected demand of 480 units per day. The tasks necessary to produce this product are: $$\begin{array} { l l l } \text { Task } & \text { Time (secs) } & \text { Immediate Predecessor } \\\hline \mathrm { u } & 30 & \text { none } \\\mathrm { v } & 30 & \mathrm { u } \\\mathrm { w } & 6 & \mathrm { u } \\\mathrm { x } & 12 & \mathrm { w } \\\mathrm { y } & 54 & \mathrm { x } \\\mathrm { z } & 30 & \mathrm { v } , \mathrm { y }\end{array}$$ If the company wants the output rate to be equal to demand, what is the minimum number of workstations needed?

A) 3
B) 4
C) 5
D) 6
E) 7