Try this if you're pressed for time.
1 pull up, 2 push up, 3 sit up
Then 2 pull up, 4 push up, 6 sit up
Do this with minimal rest until 5 pull up, 10 push up, 15 situp...then rest a minute between sets, and keep adding in the same increments until you hit 10 pull up, 20 push up, 30 sit up.
Then, run the ladder back down, 9,8,7....
It will be 100 pull up, 200 push up and 300 sit up in a half hour.