What is the decrease in average waiting time


Response to the following problem:

A single stage window at the post office experiences an average arrival rate of 14 people per hour and can service on the average 15 per hour. If the service rate is increased to 18 per hour, an increase of 20%, what is the decrease in average waiting time...in minutes?....in percentage?

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Financial Accounting: What is the decrease in average waiting time
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