Solution

Modelle von Warteschlangensystemen
E[N] = 5.64      E[N] = 9.90
(a)      (b)
E[N] = 6.35      E[N] = 4.95
(c)      (d)

The example shows that a common queue is better than two separate and that is twice as fast machine is more suitable than two parallel operators at normal speed. On the other hand two parallel machines have more output than a single machine that can process two parts simultaneously. Did you know that?