某人以5km/h的速度步行5h,休息0.5h后又以4km/h的速度步行1.5h,则他在全程的平均速度?
某人以5km/h的速度步行5h,休息0.5h后又以4km/h的速度步行1.5h,则他在全程的平均速度?
生物人气:801 ℃时间:2019-09-27 20:23:30
优质解答
(5×5+4×1.5)÷(5+0.5+1.5)=31/7
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