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题目为了方便广大游客到昆明参观游览“世博会”，铁道部门临时增开一列南宁——昆明的直达快车．已知南宁、昆明两站间的路程为828千米，一列普通快车与一列直达快车都由南宁开往昆明，直达快车的平均速度是普通快车平均速度的1．5倍，直达快车比普通快车后出发2小时，而先于
In order to facilitate the tourists to Kunming to visit and visit the “Expo”, the railway department temporarily added a direct train from Nanning to Kunming. It is known that the distance between the two stations in Nanning and Kunming is 828 kilometers. An ordinary express train and a direct express train are all driven from Kunming to Kunming. The average speed of express trains is 1.5 times the average speed of ordinary express trains. Express trains are faster than ordinary express trains. 2 hours after departure, before