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0-200¤½¤Øn13¬í
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S=200¤½¤Ø=0.2¤½¨½(km)
13s = 13/60(min) = 13/60*60(hour)
¡@¡@ =0.0036111(hour)
0.2km/0.0036111(hour)
=55.3836(km/hour)
¡°©Ò¥H200¤½¤Ø»Ý13¬í¡A®É³t¶È»Ý55.3836(km)
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