Answer: 7.5 minutes
Explanation:
From the question, we are informed that the check-in data indicate that from 9 a.m. to 10 a.m., 240 passengers checked in and that the airport management found that the average number of passengers waiting for check-in was 30.
Based on the above scenario, the average passenger will have to wait in line for:
= (30 passengers × 1 hour)/ 240 passengers
= (30 × 60)/240
= 1800/240
= 7.5 minutes