A man jogs at 6 mph over a certain distance and walks hack over the same route a

游客2024-08-10 60

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。)

转载请注明原文地址:https://www.tihaiku.com/zcyy/3714033.html

相关试题推荐

随机试题

最新回复(0)

Ourlawstatesthatallmenareequalandendowedwithcertain______rights,amon