Question: Which countries have Spanish as their main language and the time zone is UTC-05:00?
Answer(s):
answer: Peru
answer: Ecuador
answer: Panama
answer: Cuba

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06nm1)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06nm1 ns:language.human_language.countries_spoken_in ?x .
?x ns:location.country.official_language ns:m.06nm1 .
?x ns:location.location.time_zones ns:m.02_37z . 
}