SELECT T1.name ,  T1.long ,  avg(T2.duration) FROM station AS T1 JOIN trip AS T2 ON T1.id  =  T2.start_station_id GROUP BY T2.start_station_id
For each station, return its longitude and the average duration of trips that started from the station.
SELECT T1.name , T1.long , avg ( T2.duration ) FROM station AS T1 JOIN trip AS T2 ON T1.id = T2.start_station_id GROUP BY T2.start_station_id
select t1 . name , t1 . long , avg ( t2 . duration ) from station as t1 join trip as t2 on t1 . id = t2 . start_station_id group by t2 . start_station_id
For each station , return its longitude and the average duration of trips that started from the station .