HELP 应用题
问题描述:
HELP 应用题
列车甲长200米,速度20m/s向西行驶,迎面开来一辆列车乙长300米,并以10/s速度向东行驶,坐在甲列车上的人看见乙列车从他眼前驶过的时间为多少?
答
300/(20+10)=10(秒)
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