2. 外语
  3. A man jogs at 6 mph over a certain distance and walks hack over the same route at 4 mph. What is his average speed for the journ

A man jogs at 6 mph over a certain distance and walks hack over the same route at 4 mph. What is his average speed for the journ

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问题 A man jogs at 6 mph over a certain distance and walks hack over the same route at 4 mph. What is his average speed for the journey?
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答案4.8mph
解析 (mph英里/小时。设单程距离为x，平均速度=总距离/总时间=2x/(x/6+x/4)=4.8。)  
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本试题收录于： B类竞赛（英语专业本科专科）题库大学生英语竞赛（NECCS）分类
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B类竞赛（英语专业本科专科）

大学生英语竞赛（NECCS）

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