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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
admin
2019-01-16
73
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?
选项
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
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
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