Final answer:
The latest train Femi can catch to get to work on time is the one that arrives around 7:00am.
Step-by-step explanation:
In order to determine the latest train Femi can catch to get to work on time, we need to consider the time it takes for her to travel from her home to work. Let's say it takes her 30 minutes to get to work.
If Femi starts work at 7:30am and it takes her 30 minutes to get there, then the latest train she can catch would be the one that arrives at her station around 7:00am. This will give her enough time to walk to the station, wait for the train, and arrive at work by 7:30am.