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100m/30s=Xm/1s由此推得小明每秒速度是3.33m/s 50m/12s=Xm/1s得小傑每秒速度是4.17m/s 30m/8s=Xm/1s得小宏每秒速度是3.78m/s 最後得出小傑速度最快小宏第二快小明最慢
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