A、B两地之间仅有一条公路且相距300千米。某客运公司从A地早上7:00起每隔30分钟开出一辆大巴汽车驶向B地

.A、B两地之间仅有一条公路且相距300千米。某客运公司从A地早上7:00起每隔30分钟开出一辆大巴汽车驶向B地,车速为60千米/小时,进站后休息15分钟后立即由B站开回A站,下午15:00,A地开出最后一班车;另外每天早上8:00起每隔1小时由A向B开出一辆中巴汽车,车速为75千米/小时,进站后休息10分钟后立即由B站开回A站,下午16:00开出最后一班车。由A地中午12:00开出的中巴车司机在A站到B站行驶途中见到 辆该公司的大巴车;在整个来回过程中,有 辆该公司的大巴车在途中被他见到了两次。(进出站时除外)。是2009年余姚中学自主招生科学试卷中的题目,参考答案分别是18和17,如何解释?

第1个回答  2011-02-22
Air Jordan 14(XIV)
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第2个回答  2011-02-21
A地中午12:00开不出中巴车,因为8时从B站开出的中巴车12时刚到A站,要到12时10分才能开出。追问

题目第三行:另外每天早上8:00起每隔1小时由A向B开出一辆“中巴汽车”,即从8点开始到12点,刚好可发5辆,题目中问的司机驾驶的就是第5辆(12:00)出发,此时7:00出发的大巴车经过5小时刚到B点。

追答

经过测算中巴车从A到B时,赶上2辆大巴,相遇8辆大巴。回程时赶上2辆中巴,遇到7辆大巴
所以进出站时遇到的大巴不算只能看见17辆

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