首页/ 题库 / [单选题]甲、乙两辆清洁车执行东、西城间的公路清扫的答案

甲、乙两辆清洁车执行东、西城间的公路清扫任务。甲车单独清扫需要6小时,乙车单独清扫需要9小时,两车同时从东、西城相向开出,相遇时甲车比乙车多清扫15千米。问东、西两城相距多少千米:

单选题
2023-03-10 07:29
A、60千米
B、75千米
C、90千米
D、135千米
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正确答案
B

试题解析
甲乙的速度比为3:2,设全程为5份,则甲乙相遇时甲清扫了3份,乙清扫了2份,甲比乙多1份,而1份对应15千米,因此东西两城相距5x15=75千米。故正确答案为B。

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