Final answer:
Full-time workers work 7 hours a day, which is 2 hours more than part-time workers who work 5 hours a day.
Step-by-step explanation:
The question asks us to find out how many hours per day do full-time workers work if we know that part-time workers work for 5 hours a day and the difference between full-time and part-time work hours is 2 hours. To solve this, we simply add the difference to the part-time work hours: 5 hours (part-time) + 2 hours (difference) = 7 hours. Therefore, full-time workers work 7 hours a day.