Write SQL query to solve given problem: Which trip id had the longest duration and the start station is in Redwood City?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.id FROM trip AS T1 LEFT JOIN station AS T2 ON T2.name = T1.start_station_name WHERE T2.city = 'Redwood City' AND T1.duration = ( SELECT MAX(T1.duration) FROM trip AS T1 LEFT JOIN station AS T2 ON T2.name = T1.start_station_name WHERE T2.city = 'Redwood City' )