题目
一条有关RATE的数学题,
(a) Bob,by himself,can paint four rooms in 10 hours.If he hires Peter to help,they can do the same job together in 6 hours.If he lets Peter work alone,how long will it take for Peter to paint the four rooms?
(b) In part(a),if Bob works alone for 4 hours,and then they work together to complete the remaining job,then how long will it take them to finish the remaining job?
(a) Bob,by himself,can paint four rooms in 10 hours.If he hires Peter to help,they can do the same job together in 6 hours.If he lets Peter work alone,how long will it take for Peter to paint the four rooms?
(b) In part(a),if Bob works alone for 4 hours,and then they work together to complete the remaining job,then how long will it take them to finish the remaining job?
提问时间:2021-02-05
答案
(a):it will take 15 hour for peter to paint the four room.
(b):it will take 3.6 hour for them to finish the ramaining job.
(b):it will take 3.6 hour for them to finish the ramaining job.
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
最新试题
热门考点
- 1买2送一,买3送一等于打了多少的折
- 2古诗春种 ,秋收 .让我想到两样农具镂、镰刀.
- 3a+b+c=0,abc求a(b+c)+b(a+c)+c(a+b)
- 4谁来帮我编个英语对话.
- 5问几道历史题啊.
- 6解方程:1/(x的平方+x)+1/(x的平方+3x+2)+1/(x的平方+5x+6)+1/(x的平方+7x+12)+1/(x的平方+9x+20)=5/(x的平方+11x-708)
- 712x=4(25-x)的解
- 8已知一次函数Y=f(x)的图像经过点P(1,1)Q(4,7)两点,判断M(-1,-3)是否在这个函数图像上
- 9-27分之22乘(7分之22-3分之4)÷(-21分之22)=27分之38的过程是什么
- 10讨论f(x)=e^x(ax^2+x+1)的单调性