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
9
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间才能灌满?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/3712468.html
相关试题推荐
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
He______unwisely,buthewasatleasttryingtodosomethinghelpful.A、mayhave
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
Aspyistryingtosendasecretmessage,we’retryingtodecodehismessage,an
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
John:IwastryingtogetholdofJim,buthislinewasalwaysbusy...Sydney:
随机试题
Thepresidentpromisedtokeepalltheboardmembers______ofhowthenegotiation
HorsemanshipReturnedA)Bridgeport,Calif.Themene
职业是指由于社会分工而形成的具有特定专业和专门职责、并能为从业者带来一定利益的工
施工单位安排某工程的基坑挖土工作为:用两台正向铲挖土机挖土,并配备相应的汽车配套
具有何种结构的病原菌抵抗力最强A.荚膜 B.鞭毛 C.菌毛 D.异染颗粒
材料题三: 从最根本的意义上来说,文学是一项寻求认同的事业——作者通过写作
甲公司在面积为10000m2的土地上开发建设一写字楼,建筑覆盖率为45%,总楼层
一位教育工作者的真正威信在于他的____,它会对学生产生终身影响。
某房地产开发公司(增值税一般纳税人)2021年3月发生如下业务:
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
最新回复
(
0
)