You worked from 8:30 am to 2:15pm with a 1/2 hour lunch break. How long did you work?

5 hours 15 minutes i think

There are six hours between 8:00 and 2:00

Minus 30 minutes since he wasn't working at 8:00

And plus 15 because he worked 15 minutes after 2:00

So 5 hours 45 minutes

Then he had 30 minute lunch break which he wasn't working during that time

SO subtract 30 minutes from 5 hours 45 minutes

And he worked for 5hours 15 minutes