Puzzling Race

Algebra Level 3

Lily, Betty, and Louisa race each other in a 100 meters race.
All of them run at a constant speed throughout the race.
Lily beats Betty by 20 meters.
Betty beats Louisa by 20 meters.

How many meters does Lily beat Louisa by?

Image credit: Flickr US Army (by CC 2.0)

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