分针每分钟走6度;时针每分钟走0.5度.
则分针与时针每重合一次需要:360÷(6-0.5)=720/11(分钟);
一昼夜为24小时计 60X24=1440(分钟).
所以,重叠的次数为:1440÷(720/11)=22(次).
一昼夜时针分针重叠22次
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