a panic has established two counters, one for commercial banking and the second for personal banking. Arrival and service rates at the commercial counter are 6 and 12. respectively. The corresponding numbers at the personal banking counter are respectively 12 and 24. Assume that arrivals occur In Poisson processes and service times are exponentially distributed. (5.1} Assuming that the two counters operate Independently of each other. debmine the expected number of waiting customers and their mean walling time at each counter