What is the average duration in milliseconds of tracks that belong to Latin or Pop genre?
return tracks ;return genre of #1 ;return #1 where #2 is Latin ;return #1 where #2 is Pop ;return #3 ,  #4 ;return duration of #5 in  milliseconds ;return average of #6
['select', 'project', 'comparative', 'comparative', 'union', 'project', 'aggregate']