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Operations research: Queuing theory using TORA

Customers arrive at a thrift bank according to a poisson distribution with a mean of 45 customers per hour. Transactions per customer last about 5 minutes and are exponentially distributed. The bank wants to have a single line multiple-teller operation, similar to the ones used in airports and post offices. The manager is conscious of the fact that customers may switch to other banks if they perceive that their wait in line is "excessive". For this reason, the manager wants to limit the average waiting time in the queue to no more than 30 seconds. How many tellers should the bank provide?

I need help in how to enter this into TORA, and how to interpret the results.

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Operation Management, Management Studies

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