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Simple word problem I think I'm just not smart

Timmy walks twice as fast as his dog Lassie. One day, Timmy walks 1.5 miles down the road, turns around, and returns home. Lassie leaves the house at the same time and follows him until they meet on Timmy's way back home. The dog then turns around and follows Timmy back home. How far did Lassie walk?