Zhang Hong, Li Tong and Wang Li all want to go from place A to place B. At 6 am, Zhang and Li set off from place A together. Zhang walks 5 kilometers per hour, Li walks 4 kilometers per hour, and Wang Li set off from A at 8:00 am, and Wang and Zhang arrived at B at 6:00 pm at the same time. When did Wang Li catch up with Li Tong?
张宏、李桐和王丽三个人，都要从甲地到乙地，上午6时，张、李二人一起从甲地出发，张每小时走5千米，李每小时走4千米，王丽上午8时才从甲地出发，傍晚6时，王、张同时到达乙地，那么王丽什么时间追上李桐？
<result>12</result>