Fastest relay 4 x 100 metres (female)

According to Official Guinness Records,

The American 4 x 100 m relay team (Tianna Madison, Allyson Felix, Bianca Knight and Carmelita Jeter) knocked more than half a second off a record that had stood for almost 27 years when they clocked 40.82 seconds at the Olympic Stadium in London, UK, on 10 August 2012. The previous best 4 x 100 m relay run (41.37 seconds) was set by East Germany in Canberra, Australia, on 6 October 1985.

For a complete list of 2012 records, please visit 2012 Guinness Records in United Kingdom.

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