For this very simple queueing system there are exact formulae that give the statistics above under the assumption that the system has reached a steady state - that is that the system has been running long enough so as to settle down into some kind of equilibrium position. Naturally real-life systems hardly ever reach a steady state. Simply put life is not like that. However despite this simple queueing formulae can give us some insight into how a system might behave very quickly. The package took a fraction of a second to produce the output seen above.
Traffic intensity is a measure of the congestion of the system.
The simple answer is that we can analyse this using the package. The output for this situation is shown below. For two servers working at the original rate the output is as below. Of the figures in the outputs above some are identical. The simple answer is that the package can tell us, as below.