There are many reasons why some people go to work late.
Here are some reasons why:
1) Sleeping in late. Parents, or people that are striving for success in college are normaly up late taking care of what they need too.
2) Missing the bus, or not having a ride. Some people don't have cars, so they turn to buses and family. If they can't quite get family to help, the go to the bus, but bus times can change making it hard for them to get on a bus.
3) Feeling sick, when people are sick they wake up, and they don't want to do much. So they eat, get dressed, etc late. So they end up going to work late.