首页
登录
职称英语
The traffic light changes color in the order of Green-Yellow-Red, and the time d
The traffic light changes color in the order of Green-Yellow-Red, and the time d
游客
2024-01-12
27
管理
问题
The traffic light changes color in the order of Green-Yellow-Red, and the time duration for each color is 45s, 5s, 40s respectively. How many seconds at most can the red light appear in a period of 5 minutes?
选项
A、150s
B、120s
C、180s
D、160s
E、100s
答案
A
解析
一共5分钟即300秒,Green-Yellow-Red按照顺序亮一次需要45+5+40=90秒,要使红灯在这个300秒间隔内出现时间最长,那么这300秒间隔可以从红灯开始亮算起,这样经过40秒红灯后,余下260秒再开始Green-Yellow-Red循环,一个循环需要90秒,那么只能做两个循环,剩下260-90×2=80秒,按照Green-Yellow-Red顺序亮,绿灯亮去掉45秒。黄灯亮去掉5秒,还剩下80-45-5=30秒红灯亮。
那么在这300秒内,红灯最大一共亮40+40×2+30=150秒。
转载请注明原文地址:https://tihaiku.com/zcyy/3354769.html
相关试题推荐
Whenthelightsturnred,thetraffic________stop.A、canB、mayC、mustD、needC句意:
ThetrafficlightchangescolorintheorderofGreen-Yellow-Red,andthetimed
Chris:Hundredsoftrafficaccidentsannuallyareattributabletothepoorcondi
Anoverlycentralizedeconomy,notthechangesintheclimate,isresponsiblefo
Althoughcompactcarsmakeuponly38percentofthevehiclesintraffic,48per
Neverbeforehadtaxpayersconfrontedsomanychangesatonceastheyhadinthe
Section13(J)oftheSecuritiesExchangesActof1934requiresanyonewhobuysmo
Globalwarmingissaidtoberesponsibleforextremeweatherchanges,which,lik
Therearefundamentallytwopossiblechangesinaneconomythatwilleachcause
A、informthereaderofthepotentialcauseofcertainchangesinrainforestcom
随机试题
Completetheformbelow.WriteNOMORETHANTHREEWORDSAND/ORANUMBERforeach
MaintainingFriendshipinAdolescence
[originaltext]W:IheardJanewasbadlyhurtinanaccident?M:Yes.Ifonlys
Thecommandersaidtohistroopsthat___________________________(在任何情况下都不允许敌人踏
某企业为了分析本厂生产的三种产品产量的变动情况,已计算出产量指数为110%,这一
债券持有人持有的规定了票面利率、在到期时一次性获得还本付息、存续期间没有利息支付
下属方法不能增加药物溶解度的是A.制成盐类 B.加入助溶剂 C.加入助悬剂
病人,男性。急诊在硬膜外麻醉下行阑尾切除术,术后用平车护送病人入病室病室内适宜的
《平凡的世界》:路遥A.《京华烟云》:梁实秋 B.《射雕英雄传》:金庸
提出“学习风格”概念的学者是()。 A.奥苏伯尔 B.加涅 C.布鲁纳
最新回复
(
0
)