Four machines are located on either side of a bi$-$directional conveyor system as shown in Figure $1.$ For the flow

information given in Table $1,$ how can the machines be rearranged to minimize the time products spend on the

conveyor? The load transfer stations for machines A and C are located in the initial point and for machines B

and $D$ are located in the midpoint of the machine edge facing the conveyor. Distances are given in feet.

Bi$-$directional conveyor system

Figure $1$

Table $1$