Travelers arrive at an airline smart check-in with a mean rate of 50 travelers per hour. Based on the FCFS service discipline, a traveler is served every 1 minute on average and leaves the check-in. We assume that the airline smart check-in queueing system is an M/M/1 process is steady-state condition. Calculate L; the expected number of travelers in the airline smart check in queuing system. Explain your answer