PLEASE! HELP ME ! COME ON !
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/15 10:51:43
PLEASE! HELP ME ! COME ON !
(1)一座铁路桥全长1200米,一列火车开过大桥需花费75秒,火车开过路旁电杆,只要花费15秒,那么火车全长是多少米?
(2)一人以每分钟120米的速度沿铁路边跑步,一列长288米的火车从对面开来,从他身边通过用了8秒钟,求列车的速度.
下午4点就上课了
会的帮下忙 否则就要下“暴雨”了 “打雷”了 help me !
(1)一座铁路桥全长1200米,一列火车开过大桥需花费75秒,火车开过路旁电杆,只要花费15秒,那么火车全长是多少米?
(2)一人以每分钟120米的速度沿铁路边跑步,一列长288米的火车从对面开来,从他身边通过用了8秒钟,求列车的速度.
下午4点就上课了
会的帮下忙 否则就要下“暴雨”了 “打雷”了 help me !
设火车长X
(1200+X)/75=X/15
X=300 答:长300米
288÷8-120÷60=36-2=34(米/秒)
答:列车的速度是每秒34米.
(1200+X)/75=X/15
X=300 答:长300米
288÷8-120÷60=36-2=34(米/秒)
答:列车的速度是每秒34米.
PLEASE! HELP ME ! COME ON !
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