Page "Sprint (running)" Paragraph 36
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Wikipedia
* Another informal distance, which could be used to aid a 200 m runner's stamina, or a 400 m runner's speed.
As of 27 May 2010 the world's best for this event was 30. 85 seconds, set by Michael Johnson in Pretoria in 2000.
The women's record is 35. 30 seconds, set by Ana Guevara in Mexico City.
Junior girls in several countries run this distance instead of the 400 metres.
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1.903 seconds.