Question

A machine shop has two machines, A and B. Four jobs need to be processed through machine A first and B second. Job 1 will take one hour on machine A and three hours on machine B. Job 2 will take three hours on A and two hours on B. Job 3, seven on A and three on B. Job 4, five hours on A and one hour on B. Using Johnson's rule, in what order should these jobs be done?

Answer

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