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A man jogs at 6 mph over a certain distance and walks hack over the same route a
A man jogs at 6 mph over a certain distance and walks hack over the same route a
游客
2024-08-10
50
管理
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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