user: Question: What is the departure for Peterborough East whose arrival time is 12.40?
Columns: ['Departure', 'Going to', 'Calling at', 'Arrival', 'Operator']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['03.29', 'Peterborough East', 'Wansford, Peterborough East', '04.05', 'LNWR']
SQL:

assistant: SELECT "Departure" FROM "Table" WHERE "Going to" = 'Peterborough East' AND "Arrival" = '12.40';