What Is the Implied Service Rate Per Service-Counter Employee at an Airport

Multiple Choice

What is the implied service rate per service-counter employee at an airport automobile rental counter if customer demand is 36 customers per hour, two service-counter employees are on duty, and their labor utilization is 75%?

A) More than 5 but less than or equal to 10 customers per hour
B) More than 10 but less than or equal to 15 customers per hour
C) More than 15 but less than or equal to 20 customers per hour
D) More than 20 customers per hour