A fortune teller has a kiosk at the local mall. On average, customers arrive at the kiosk every 20 minutes. The average duration of a reading is 15 minutes. Assume that both customer interarrival times and reading times are exponentially distributed.

a) What is the throughput of the kiosk's operation?

b) What is the capacity of the kiosk's operation?

c) On average, how long does a customer spend at the kiosk from the time they arrive until the end of their reading?