Jiajia and Yaoyao like riding bicycles very much. One day, the two of them set off from the same place on the ring road at the same time by bicycle, walking backwards. It takes Jiajia 60 minutes to ride a lap, and the two met 45 minutes after departure, so how many hours does it take Yaoyao to ride a lap?
佳佳和瑶瑶很喜欢骑自行车．有一天，她们两个骑自行车从环形公路上同一地点同时出发，背向而行．佳佳骑一圈要60分钟，出发后45分钟两人相遇，那么瑶瑶骑一圈要多少小时呢？
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