Question $6(1$ point$)$

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box$2.$png

A manufacturing plant has four stations in the assembly line $($illustrated in the image above$).$ A unit needs to be processed at either Machine A or Machine B for Station $2($parallel lines, both lines performing the same operations$).$ The box is then processed at Station $3.$ After that, the unit needs to be processed at either Machine A$,$ Machine B or Machine C in Station $4$ before leaving the production line. The process time of each station$/$machine is indicated in the flowchart. What is the process time of this system measured in minutes?

Question $6$ options:

$20$ minutes

$6$ minutes

$60$ minutes

$81$ minutes