A Restaurant at a Popular Colorado Casino Provides Priority Service

A restaurant at a popular Colorado casino provides priority service to player's card holders. The restaurant has 10 tables or booths where customers may be seated. The service time (time a booth or table is occupied) averages 40 minutes once a party is seated. The customer arrival rate is 12 parties per hour, with the parties being equally divided between card holders and people without player's cards. On average, how many parties with player's cards are waiting to be seated?

A) 0.52
B) 0.41
C) 0.88
D) 1.23
E) 1.75