The difference in hours between full-timers and the part-timers who work 2 hours a day is 2 working hours. How many hours per day do full-timers work?

4 hours

Step-by-step explanation:

X: Working hours by full-timer workers

Y: Working hours by Part-timer workers

Following the problem:

Y=2 and X-Y=2

so, clearing the equation and replacing Y value in it

X=2+Y = > X=4 hours