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(2009•黄冈)小高从家门口骑车去单位上班,先走平路到达点A,再走上坡路到达点...
(2009•黄冈)小高从家门口骑车去单位上班,先走平路到达点A,再走上坡路到达点B,最后走下坡路到达工作单位,所用的时间与路程的关系如图所示.下班后,如果他沿原路返回,且走平路、上坡路、下坡路的速度分别保持和去上班时一致,那么他从单位到家门口需要的时间是( )
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A.12分钟
B.15分钟
C.25分钟
D.27分钟
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