Task: Question Generation
Input (English): #1 return trips 
#2 return starting points of #1 
#3 return latitudes of #2 
#4 return longitudes of #2 
#5 return average of #3 
#6 return average of #4 
#7 return #5 ,  #6
Output (English): What is the average latitude and longitude of the starting points of all trips?