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某人要到60千米外的农场去,开始他以5km/h的速度步行,后来又以速度是18km/h的拖拉机把他送到农场,总共用了5.5h,他步行了

单选题
2021-09-01 23:00
A、15km
B、20km
C、25km
D、30km
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正确答案
A

试题解析

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某人要到60千米外的农场去,开始他以5km/h的速度步行,后来又以速度是18km/h的拖拉机把他送到农场,总共用了5.5h,他步行了
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