What are the locations and representatives' names of the gas stations owned by the companies with the 3 largest amounts of assets?
select t3.location, t3.representative_name from station_company as t1 join company as t2 on t1.company_id = t2.company_id join gas_station as t3 on t1.station_id = t3.station_id order by t2.assets_billion desc limit 3