Final answer:
An employer can interview 3 people every hour. It will take 3 hours to interview 9 people.
Step-by-step explanation:
To find how long it will take to interview 9 people, we divide the total number of people (9) by the number of people interviewed per hour (3). This gives us 3 hours since the employer can interview 3 people every hour.
Learn more about Time taken to interview multiple people