Xiaoming, Xiaoxi, and Xiaogang are walking on the same circle, Xiaoming can do a week in 3 seconds (3/4), Xiaoxi can do a week in 2 seconds (2/3), Xiaogang can do a week in 5 seconds (5/14), if three people set off at the same time, on the same place, and in the same direction on the circle, ask how long it will take before meeting at the starting point again.
小明、小喜、小刚三人在同一圆周上行走，小明3秒钟可行一周的(3/4)，小喜2秒钟可行一周的(2/3)、小刚5秒钟可行一周的(5/14)，若三个人在圆周上同时、同地、同方向出发，问经过多少时间，再相会于出发点．
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