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
2024-08-09
14
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
题干意思是:你打开浴缸里的两个龙头,却不小心把浴缸的塞子给漏掉了。通常热水龙头需要8分钟来充满浴缸,冷水龙头需要10分钟。然而,水通过塞子孔在5分钟内流出。请问洗澡水要多长时问才能灌满?由于浴缸的体积不变,因此不管是热水还是冷水,灌满后的水的量是一样的。设浴缸容量为m,x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m/8,同理冷水每分钟充满m/10,而放水管每分钟放水m/5,故可列方程(m/8+m/10-m/5)mx=m,解得n=40,即需40分钟。由此可知本题答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3711906.html
相关试题推荐
He______unwisely,buthewasatleasttryingtodosomethinghelpful.A、mayhave
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Warning;Poisonous!Ifaccidentallyswallowed,______vomitingatonceandseekme
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
WhileworkingonacaseDr.Watsonaccidentallyfelldowna30ftdrywishingwel
随机试题
[originaltext]W:Isthatpartofthedifficultytoo,thattheroadsandbridges
AccordingtoProfessorGauderman,childrenaremorelikelytodeveloprespirator
A.两者相同 B.2倍 C.4倍 D.8倍
在处理事故中,安全资料能为分析事故原因提供重要依据。()
微脉的主病是A、气虚血少 B、气虚有湿 C、阴阳气血俱虚 D、诸虚诸湿
部分教师平时与学生缺乏交流沟通,不愿花力气研究和掌握学生的思想动态,这反映了这些
图中的文字与哪个历史人物所处时期最为接近? A.武则天 B.王昭君 C.西
(2020年真题)某商场地上一层至五层为商业营业厅,每层建筑面积为4000m2室
基金管理人必须以投资者的利益为最高利益。()
根据契税法律制度的规定,下列各项中,属于契税纳税人的是()。A.受让土地使用权
最新回复
(
0
)