$2.$ Assume you are managing a manufacturing line consisting of two workstations: Decambering and Hemming. The mean effective process time of the first machine is $45$ minutes and its coefficient of variation is $1($i$.$e$.,$ exponential distribution$).$ The second machine has the same coefficient of variation, but this machine takes $42$ minutes to process a part.

$($a$)$ Ifthereisaninfinitebufferbetweenthemachines,computetheexpectedWIP,CT$,$andTH.

WIP: $\_\_\_\_\_\_\_\_\_$ TH: $\_\_\_\_\_\_\_\_\_$ CT: $\_\_\_\_\_\_\_\_\_$