Please answer below question

You are planning the new layout for the local branch of the Sixth Ninth Bank. You are considering separate cashier windows for the three different classes of service. Each class of service would be separate with its own cashiers and customers. Oddly enough, each class of service, while different, has exactly the same demand and service times. People for one class of service arrive every 3 minutes and arrival times are exponentially distributed (the standard deviation is equal to the mean). It takes 7 minutes to service each customer, and the standard deviation of the service times is 3 minutes. You assign 2 cashiers to each type of service.

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A. On average, how long will each waiting line be at each of the cashier windows? (Round your intermediate calculations to 4 decimal places and final answer to 3 decimal place.)

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B. On average how long will a customer spend in the bank? Assume they enter, go directly to one line, and leave as soon as service is complete.(Round your intermediate calculations to 4 decimal places and final answer to 3 decimal place.)

You decide to consolidate all the cashiers so they can handle all types of customers without increasing the service times.

c.

What will happen to the average amount of time a customer spends in the bank?

	It will stay the same
	It depends on the queue structure
	It will decrease
	No such conclusion can be drawn
	It will increase

D. what will happen to the average amount of time a customer spends in the bank? (increase, decrease, stay the same, depends on the??)