DeeTee took two and half hours to complete his office work.
At what time DeeTee is finishing his work?
The numbers 1 to 12, or the big lines or big dots on the clock denote hours.
From 12:00 to 1:00 = 1 hour
1:00 to 2:00 = 1 hour
2:00 to 2.30 = 30 minutes = half an hour
So, DeeTee will complete his office work at 2.30.