A customer service center has customers call with questions about the use of a product.The mean arrival rate of customer calls is 20 per hour and follows a Poisson distribution.The mean service rate (how long it takes the call center employee to answer the customer's question) is 30 customers per hour (most customer questions can be answered rather quickly) and follows an Exponential distribution.

If the company decides to hire a second person to answer calls (there are now two "servers" in this system), the waiting time should be faster.On average, how long will a customer now wait on hold for their question to be answered?