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龟兔赛跑，全是技巧
龟兔赛跑，他们同时从a点出发跑到B点。再原路返回。已知A、B两点的路程为1800米，乌龟每分钟跑30米，兔子每分钟跑330米。起跑后多少分钟乌龟和兔相遇，它们距离B点多少米？
五年级秒思数学33/64
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