Posted by **Akshat121** on Wednesday, September 25, 2013 at 2:50am.

Distance runners often run around an approximately circular trajectory. However, since some runners are running at a larger radius than others, they must be given an advantage in the beginning so that the race is fair.

If the path of the runner running at a greatest radius of 20 m is 100 m long, how far behind in m should the runner at the smallest radius start? The smallest radius is 15 m.

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**bobpursley**, Wednesday, September 25, 2013 at 10:11am
distance will be proportional to radius.

(perimeterofCircle=PI*2*radius)

difference in perimeters=2PI*(20-15)

so that distance is the how far behind should the inner radius be.

- Physics -
**Anonymous**, Friday, September 27, 2013 at 3:04pm
So, what is the answer?

- Physics -
**John**, Sunday, September 29, 2013 at 4:57pm
I am not sure how you are calculating this problem since you wrote it in abbreviations so could you please explain again?

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