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
2025-02-23
43
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/3969331.html
相关试题推荐
______bythesurrealityofhistoryandthechangesunleashedbythe60’s,manyw
Ratherthanallowingthesedramaticexchangesbetweenhercharacterstodevelop
Effortsarefinallybeingmadeto______thetrafficcongestionthatplaguesthed
Theexecutivewasfaultedforacting______,forimplementingsweepingchangeswi
ArchitecturescholarSandyMcCreeryrecentlyarguedthattrafficcongestion,far
Changesoffashionandpublictasteareoften(i)____andresistanttoanalysis,
Whilescientistsdismissasfancifultheideaofsuddenchangesinageneticcod
Beforeadaptingtochangesinvalues,manypreferto(i)______,to(ii)______th
DoyouthinktheInternethelpbringalotofgoodchangestoourlives? Withou
Haveyoueverseenanybehavioursthatbreakthetrafficrulesinyourcity? Ho
随机试题
Englishisoneoftheworld’smostwidelyspokenlanguages.Thisispartly
Hello,everybody.Thankyouverymuchforinvitingmehere.It’sverypleasa
LastyearintheUnitedStates,womenwhoranforstateandnationalofficeswer
Suddenlythereappearedayoungwoman(dress)______inpink.dressed本题考查形容词作定语的用法。
2003~2007年,SCI平均每年约收录多少篇中国科技论文?A.5.9万
在密实砂土地基中进行地下连续墙的开槽施工,地下水位与地面齐平,砂土的饱和重度Y
不成文宪法国家的宪法形式有()。 A.宪法B.宪法性法律C.宪法判例D
某房地产开发公司(增值税一般纳税人)收到主管税务机关的《土地增值税清算通知书》,
关于投资性房地产的后续计量,下列会计处理方法中不正确的是( )。 A.只有存
鉴别结核性与病毒性脑膜炎最有意义的是A.脑脊液细胞数 B.脑脊液的透明度 C
最新回复
(
0
)