Waiting line analysis: Club is considering consolidating its two service desks into o

Need2Nnow

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Question: Sharp Discounts Wholesale Club is considering consolidating its two service desks into one location staffed by two clerks. Currently two service desks exist, one at each entrance of the store. Customers arrive at each service desk at an average of one every six minutes. The service rate at each service desk is four minutes per customer. If consolidated the clerks will continue to work at the same individual speed of four minutes per customer.

A What is the probability of waiting in line?
B How many customers, on average, are waiting in line?
C How much time does a customer spend at the service desk (waiting plus service time)?
D Do you think the Sharp Discounts Wholesale Club should consolidate the service desks?

I came up with Lambda = 10 and Mu = 15

For A I used S(Mu)/Lambda minus 1 and came up with 2.66

For B I used Lq = Lambda/Mu and came up with 1.33

For C I used Ls/Lambda and came up with 12 minutes

And D I think they should consolidate as the total time in the system will be reduced by two minutes.

I do not understand these type of problems and guessed at everything; did I get any correct at all?
 
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