The perimeter of the track and field track is 400 meters. 1. The straight part of the track is selected for the 100 meter race. What is the distance for the athletes to complete the whole race? What is the displacement? 2. In the 800 meter gun race, do athletes from different runways finish the same distance? Please think about it according to the rules of track and field competition

The perimeter of the track and field track is 400 meters. 1. The straight part of the track is selected for the 100 meter race. What is the distance for the athletes to complete the whole race? What is the displacement? 2. In the 800 meter gun race, do athletes from different runways finish the same distance? Please think about it according to the rules of track and field competition

400m distance 400m, displacement 0
100m journey, 100m displacement

The perimeter of the track and field track is 400m. The straight part of the track is selected for the 100m race. What is the distance for the athlete to complete the whole race? What is the displacement?
100m .100 m .
Why?

The topic is not about the 100 meter race, so the distance of each athlete is the same, and because the straight track is selected, the displacement is also 100 meters~

The perimeter (inner ring) of a track and field field is 400m, in which the inner rings of two curves (semicircles) are 200m long in total, and the straight section is 200m long in total, and each runway is 1m wide (in total)
The above address is the original question. Is the answer to the second question of the best answer correct

That's right. In the question, Δ R is the total width of the six runways, and the difference between the inner radius and the outer radius is this width