My Sister Can Walk from School to Home in 40

Essay

My sister can walk from school to home in 40 minutes. I can walk from school to home in 30 minutes. But today I stayed for some extra help, and my sister was already 2/5 of the way home when I started.
If I walk at my usual speed, can I catch my sister before she gets home?
If YES, exactly what fraction of the trip have we covered when I catch her?
If NO, exactly what fraction of the trip have I covered when my sister gets home?
In either case, write enough (words, numbers, drawings) to make your thinking clear.