公共汽车站停着10辆公共汽车。
第一辆骑车开出后,每隔8分钟有一辆汽车接着开出。
在第一辆骑车开出后的两分钟有一辆汽车开进车站,以后每隔10分钟有一辆车开进车站,又依次在原先10辆车后,按照8分钟间隔开出。
问第一辆汽车开出后多久,车站内没有汽车?
392 minutes? |
菜花,我去教会大闹天宫,提了很多关于圣经的疑问,被一个女的给踢了 |
我们到基督人生论坛去说吧。提出疑问是很正常的,怎么会是“大闹天宫“呢 ?踢人无论如何都是不对的。 |
I don't have the answer. My calculation is 360min. |
I did it as follows: Let x be the number of buses drive in, 2+10(x-1)=8(x+10-1) 10x-8=8x+72, x=40 2+10*39=392 Is it right? |
Suppose there are two buses initially, then the time when there is no bus at the station is 40min. Use your formular, I got 72min. I use formula: 10-1=x/8-x/10, where x=total time. Here is the table for two buses situation: Time 0 2 8 12 16 22 24 32 40 Buses 1 2 1 2 1 2 1 1 0 |
My equation is to find the time when the last bus drives in and drives out immediately. Thanks for your patient explanation! |
设时间t后车站空站,x为进站车总数,则t/8+1=10+x,x=2+(t-12)/10,于是t=392 本贴由[huxlnn]最后编辑于:2006-1-11 7:31:57 |
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