速率六下 - 自行車

By Daniel
at 2011-01-24T00:00
at 2011-01-24T00:00
Table of Contents
冠宏騎自行車到離家6公里的外婆家玩,去程花了45分鐘,回程花了40分鐘,冠宏騎自行車平均時速是多少公里?
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自行車
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By William
at 2011-01-26T17:22
at 2011-01-26T17:22
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