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時針走一圈(360°)需要12小時=12*60=720分鐘,即時針的速度是360/720=0.5°/分鐘; 分針走一圈(360°)需要1小時=60分鐘,即時針的速度是360/60=6°/分鐘. 所以時鐘由2點30分走到2點55分時,時針、分針都走了25分鐘, 所以時針轉過了0.5*25=12.5°,分針轉過6*25=150°.
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