Xiao Ming and Xiao Jie are on the circular track, it takes Xiao Ming 60 seconds to run a lap, and Xiao Jie takes 40 seconds to run a lap. Now the two set off at the same place at the same time, and they meet again at the same place a few minutes later?
小明和小杰在环形跑道上，小明跑一圈要60秒，小杰跑一圈要40秒．现在两人同时同地出发，几分钟后两人又在原地相会？
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