15.4.3 Queuing systems

Problem: There are three machines, working in the manufactory, which break down with intensities ${\lambda }_1,{\lambda }_2,{\lambda }_3$ (per day) respectively. There are two regulators in the staff, eliminating the breakdowns of machines with intensities ${\mu }_1,{\mu }_2$ (per day) respectively. It is required to plot the graph of this queuing system and find the fraction of time, both regulators are busy with work. $$\text{Unknown environment 'tabular'}$$