甲乙赛跑,甲跑全程三分之二处,乙跑全程的四分之三处,这时甲乙相距0.25千米,乙跑完全程,甲需多少时到终点
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![甲乙赛跑,甲跑全程三分之二处,乙跑全程的四分之三处,这时甲乙相距0.25千米,乙跑完全程,甲需多少时到终点](/uploads/image/z/11974289-41-9.jpg?t=%E7%94%B2%E4%B9%99%E8%B5%9B%E8%B7%91%2C%E7%94%B2%E8%B7%91%E5%85%A8%E7%A8%8B%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C%E5%A4%84%2C%E4%B9%99%E8%B7%91%E5%85%A8%E7%A8%8B%E7%9A%84%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%89%E5%A4%84%2C%E8%BF%99%E6%97%B6%E7%94%B2%E4%B9%99%E7%9B%B8%E8%B7%9D0.25%E5%8D%83%E7%B1%B3%2C%E4%B9%99%E8%B7%91%E5%AE%8C%E5%85%A8%E7%A8%8B%2C%E7%94%B2%E9%9C%80%E5%A4%9A%E5%B0%91%E6%97%B6%E5%88%B0%E7%BB%88%E7%82%B9)
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甲乙赛跑,甲跑全程三分之二处,乙跑全程的四分之三处,这时甲乙相距0.25千米,乙跑完全程,甲需多少时到终点
甲乙赛跑,甲跑全程三分之二处,乙跑全程的四分之三处,这时甲乙相距0.25千米,乙跑完全程,甲需多少时到终点
甲乙赛跑,甲跑全程三分之二处,乙跑全程的四分之三处,这时甲乙相距0.25千米,乙跑完全程,甲需多少时到终点
V甲:V乙=2/3:3/4=8/9,舍全程为s
则(3/4-2/3)s=1/12s=0.25km,得s=3km
当乙再跑全程的1/4时,甲跑了全程的8/9×1/4s=2/9s
∴甲剩下的路程为全程的(1-2/3-2/9)s=1/9s=1/9×3km=1/3km.