If a service operation follows an M$/$M$/1$ queue model with an arrival rate $(\backslash$lambda $)$ of $5$ customers per hour and a service rate $(\backslash$mu $)$ of $8$ customers per hour, what is the average waiting time in the queue $($Wq$)?$

Question $18$ options:

$0\mathrm{.}125$ hours

$0\mathrm{.}2$ hours

$0\mathrm{.}25$ hours

$0\mathrm{.}33$ hours

None of the above