user: Question: Which station has 3871 riders per mile, and an annual ridership in 2012 of larger than 15399400?
Columns: ['Annual ridership (2012)', 'Rider. per mile', 'Opened', 'Stations', 'Lines']
Types: ['real', 'real', 'real', 'real', 'real']
Sample row: [2544892400.0, 37613.0, 1904.0, 468.0, 24.0]
SQL:

assistant: SELECT "Stations" FROM "Table" WHERE "Rider. per mile" = 3871.0 AND "Annual ridership (2012)" > 15399400.0;