I am confused as to why for this question below we didn’t use the following approach because after coming equal to Jane at 675 meters, bib as to cover another 325 meters to overtake her twice so the time for that would be 325/4 but in the solution video Greg said that to find out how will he overtake her twice we will divide 1000/4 but why 1000 because both of them have already covered 675 meters ?

I have outlined my solution below so I want to understand where am I going wrong.

Hello again @Archi ,
So I think you are missing something in the step below.

As you corrected pointed out that the relative speed is 4m/s. When you want to catch the person again, you and the person will be moving together. This can be better understood if we chart the distance covered. Let’s consider 100 m track for simplicity.

wait…I think I got it. So, basically it is a circular track and the first time when Bob takes over Jane he gets a lead over her and is running ahead of her which means to overtake her second time he still has to complete 1000 meters lap again since they both are running at different speeds and both are in motion so he can take over again only when he completes full lap right?

@Leaderboard Is it possible to find resources on the website to solve relative problems? I think I need more practice for such type of problems so are there any video on the website or a dedicated series that just deals with distance and speed problems?