两车相遇时间是什么时候
- 时间:2020-05-20 15:28:23
- 分类:数学世界
- 阅读:171 次
数学题: 甲、乙两站之间的铁路长1660km,8月30日晚9:30,一列客车以每小时90km的速度从甲站开往乙站,当晚11点一列货车以每小时93km的速度从乙站开往甲站。那么两车相遇时间是什么时候?
数学题解答:首先算出客车先出发的1.5小时行了多少路程?
1.5 × 90 =135(千米)
再算两车同时出发一共行的路程?
1660 – 135 = 1525(千米)
再算出两车相遇所用的时间:
1535 ÷ (90+93)=8又1/3(小时)=8小时20分
相遇的时刻:
23时+8小时20分-24时=7时20分
答:两车相遇的时间是第二天的7时20分。
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