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.

If all arriving customers wait in a common line for the next available stylist, how long would a customer wait in line before being served, on average? HINT: Think M/M/s

Group of answer choices

29.7 minutes

21.7 minutes

2.9 minutes

33.1 minutes