首页
登录
职称英语
You are trying to fill a bath with both taps on, but have accidentally left out
You are trying to fill a bath with both taps on, but have accidentally left out
游客
2024-08-11
35
管理
问题
You are trying to fill a bath with both taps on, but have accidentally left out the plug. Normally the hot water tap takes 8 minutes to fill the bath and the cold water tap takes 10 minutes. However, the water empties out through the plug hole in 5 minutes. How long will it take for the bath to fill?
选项
答案
40 minutes.
解析
(设浴缸容量为x,n为三管一起开的充满水的时间,热水充满浴缸要8分钟,所以每分钟充满x/8,同理冷水每分钟充满x/10,而放水管每分钟放水x/5,故可列方程(x/8+x/10一x/5)×n=x,解得n=40,即需40分钟。)
转载请注明原文地址:https://tihaiku.com/zcyy/3714683.html
相关试题推荐
Iwentaroundsniffingattheotherdoors,tryingtofindoutwherethesmellwa
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
TurnontheTVorwebpage,andyoumayseeamousetryingtosellyousometh
TurnontheTVorwebpage,andyoumayseeamousetryingtosellyousometh
随机试题
MayfieldCollegeItalianforBusiness5xthree-hourlessonstwiceweeklybeginni
Pre-courseLectureof"AmericanNovelSince1945"Tolearnt
WhichofthefollowingisNOTaU.S.newsandcablenetwork?A、ABCB、CNN.C、CBS.
Sexprejudicesarebasedonandjustifiedbytheideology(意识形态)thatbiolog
Thegrandmotherdidn’twanttogotoFlorida.Shewantedtovisitsomeofhe
(1)HazelaskshowonecanstayhealthyworkingthehoursI’vebeenworking.Here
Itisplaincommonsense--themorehappinessyoufeel,thelessunhappiness
[originaltext]TheUSpresidenthassaidthetimehascomeforareviewont
治疗慢性再生障碍性贫血的首选药是A.糖皮质激素 B.免疫抑制剂 C.造血因子
急性阑尾炎穿孔A.草绿色透明腹水 B.黄色、混浊、含胆汁性液体 C.稀脓性略
最新回复
(
0
)