user: Question: Which rider had a speed of 90.57mph?
Columns: ['Place', 'Rider', 'Country', 'Machine', 'Speed', 'Time', 'Points']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'Kel Carruthers', 'Australia', 'Yamaha', '96.13mph', '2:21.19.2', 15.0]
SQL:

assistant: SELECT "Rider" FROM "Table" WHERE "Speed" = '90.57mph';