If I came into work at 9:15 and left at 4:00 how many hours is that?

Question

If I came into work at 9:15 and left at 4:00 how many hours did I work?

Answer 1

You would have worked 6 hours and 45 minutes provided there were no lunch or other breaks in there.  You come to this answer by taking the seven hours between 9 and 4 and subtracting the fifteen minutes you were not at work.