Show me how to do this step$-$by$-$step in ExtendSim: EX $8-3$ A service facility consists of two servers in series $($tandem$),$ each with its own FIFO

queue. $($See Figure $8\mathrm{.}63.)$ A customer completing service at Server $1$ proceeds to Server $2,$ and a

customer completing service at Server $2$ leaves the facility. Assume that the interarrival times of

customers to Server $1$ are exponentially distributed with a mean of $1$ minute. Service times of

customers at Server $1$ are exponentially distributed with a mean of $0\mathrm{.}7$ minute, and at Server $2,$

they are exponentially distributed with a mean of $0\mathrm{.}9$ minute.

A$.$ Run the simulation for $1000$ minutes and estimate for each server the expected average

waiting time in the queue for a customer and the expected use.

B$.$ Suppose that there is a travel time from the exit of Server $1$ to the arrival to Queue $2($or

Server $2).$ Assume that this travel time is distributed uniformly between $0$ and $2$ minutes.

Modify the simulation model and run it again to obtain the same performance measures

as in Part $($A$).($Hint: You can add an Activity block to simulate this travel time. A

uniform distribution can be used to simulate the time.$)$

C$.$ Suppose that no queuing is allowed for Server $2.$ That is$,$ if a customer completing

service at Server $1$ sees that Server $2$ is idle, the customer proceeds directly to Server $2,$

as before. However, a customer completing service at Server $1$ when Server $2$ is busy

with another customer must stay at Server $1$ until Server $2$ gets done; this is called

blocking. When a customer is blocked from entering Server $2,$ the customer receives no

additional service from Server $1$ but prevents Server $1$ from taking the first customer, if

any, from Queue $1.$ Furthermore, new customers may arrive to Queue $1$ during a period

of blocking. Modify the simulation model and rerun it to determine the same performance

measures as in Part $($A$).$