推荐回答（2个）
1、 同学们进行了50米赛跑比赛，平平用了12秒，比小华多用了1秒，小花比平平多用1秒，谁跑得最快？
2、 一节课40分，从8点30分上课应当到几点几分下课？
3、 王老师上午7：30到校上班，11：30下班，上午在校的时间是多少？
4、 贝贝做家庭作业用了50分，正好在晚上8：00做完，贝贝是晚上几时几分开始做作业的？
5、 做一个零件从上午7：40分开始做，上午9：20分完成，做这个零件用了多长时间？
6、 小玲家的钟停了，电台广播2点时，奶奶跟电台对时，由于年老眼花，把时针与分针颠倒了，小玲放学回家时见钟才2点整，大吃一惊，，请你帮助想一想，现在应该是几点钟？
7、 小王骑自行车去A地，上午8时出发，在途中因有事停留了15分钟，到中午12时才到达A地，小王骑自行车行了多少时间？
8.钟表5点种响5次振铃用了8秒，那么12点响多少次振铃？
9、 小奇从家到学校跑步去和回要8分钟，如果去时步行，回来时跑步一共需要10分，那么小奇来回都是步行要几分钟？
10、冬冬做作业，写语文作业用去规定时间的一半，写数学作业用去剩下时间的一
半，最后5分钟读书，冬冬完成全部作业作去了多长时间？
11、一只蜗牛从20厘米深的沟底往上爬，每爬4厘米要2分钟，然后停1分，问蜗牛从沟底爬到沟沿上要用多长时间？
12．明明家的台钟，一点钟响铃一下，两点钟响铃两下，三点钟响铃三下，八点钟响铃八下，有一次明明听见台钟响铃一下，没多久又响响了一下，后来又响了一下，你知道最后一响是几点钟吗？
13、 小红从家出发时是7:20到学校时间后预习20分钟后开始上课8:40下课每节课是40分钟问从小红家到学校需要多长时间
14、 小明每小时可以画4副画从800到10:40中间休息了10分钟问小明在这段时间里一共可以画几幅画
15 、 小刚从家以每小时1千米的速度走路去图书馆出发半小时后又折回拿借书证最后一共用了2时30分钟到达图书馆问从家到图书馆有多远
我给你找个初中的吧，死难，全班就我们几个天才做出来了
题意大体是这样
一个表垂直于桌面，在表的分针上有一点A当三点半时A点与桌面之间的距离是10
当三点四十五十A点距桌面的距离是16问当三点五十时A点距桌面的距离
正确答案：19
解题思路
根据A当三点半时A点与桌面之间的距离是10当三点四十五十A点距桌面的距离是16可以推断出
A到表心的距离为6，根据三点五十可以推断出3：50时的分针与3：45时的分针夹角为30度由此可以推断出距离为19
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