The inside lane in the track is 50m and the outside of the track is 100m

4 lanes are added around the outside of the track shown above. Each lane is 1 meter wide and the lanes are immediately next to each other with no space in between. If Teresa runs once around the outside lane, and Martina runs once around the inside lane, how much further does Teresa run than Martina?

What was wrong with my other answer? You gave the inside and outside distances, the difference is 100-50 meters.

Well I didn't understand it I have the following options:

6m
4m
3m
(50+60)m

Then I totally don't get the picture.

To find out how much further Teresa runs than Martina, we need to compare the distances they each run.

First, let's find the distance Martina runs. We know that the inside lane is 50m, so she runs once around it. Therefore, Martina runs a total distance of 50m.

Next, let's find the distance Teresa runs. We are given that the outside of the track is 100m. Since each added lane is 1m wide, we need to add the total width of the additional lanes to the 100m distance.

There are four additional lanes, each 1m wide, which gives us a total width of 4m for these lanes. Adding this to the 100m distance of the outside lane, we get a total distance of 104m that Teresa runs.

To find how much further Teresa runs than Martina, we subtract the distance Martina runs from the distance Teresa runs:

104m - 50m = 54m

Therefore, Teresa runs 54m further than Martina.