SELECT avg(T1.lat) ,  avg(T1.long) FROM station AS T1 JOIN trip AS T2 ON T1.id  =  T2.start_station_id
What is the average latitude and longitude of all starting stations for the trips?
SELECT avg ( T1.lat ) , avg ( T1.long ) FROM station AS T1 JOIN trip AS T2 ON T1.id = T2.start_station_id
select avg ( t1 . lat ) , avg ( t1 . long ) from station as t1 join trip as t2 on t1 . id = t2 . start_station_id
What is the average latitude and longitude of all starting stations for the trips ?