Xiaohua, Xiaoli and Xiaoxia all want to go from place A to place B. Xiaohua and Xiaoli start from place A together at 6:00 in the morning. Xiaohua walks 5 kilometers per hour, and Xiaoli walks 4 kilometers per hour. Kilometers, and Xiaoxia only set off from Jiadi at 8 o'clock in the morning. At 6 o'clock in the evening, Xiaohua and Xiaoxia arrive at B at the same time. Question: When did Xiaoxia catch up with Xiaoli?
小华、小丽和小霞三人都要从甲地到乙地，早上6时小华和小丽两人一起从甲地出发，小华每小时走5千米，小丽每小时走4千米，而小霞上午8时才从甲地出发．傍晚6时，小华和小霞同时到达乙地．问：小霞是什么时间追上小丽的．
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