Do not copy any exited answers on this web , its not the same numbers , otherwise dislike

3. In a coffee shop the cashier can serve 30 customers, on the average each hour. The customers arrive at the shop every 12 minutes, on the average. Find the following: (i) Average waiting time in the system (ii) Average waiting time of a customer in queue (iii) Average number of employees in the system (iv) Average number of employees in the queue