A hair salon is run by two stylists, Bob and Susan, each capable of serving 5 customers per hour, on average. Eight customers arrive at the salon per hour, on average. Assume Poisson arrivals and exponential service times.

Suppose that 50% of the customers want to be served only by Bob and the other 50% only by Susan. How long would a customer wait in line, on average? HINT: Think two M/M/1 systems

Group of answer choices

60 minutes

25.3 minutes

31.7 minutes

48 minutes