I think its algebra question can some one illustrate it .
2006-10-11 09:14:21 · 9 answers · asked by masterjeee 1 in Education & Reference ➔ Homework Help
the first person paints at a rate of 1w/4hr
the second at a rate of 1w/3hr
the time is equal so one wall
gets painted in time t
t(1/3+1/4)=1
t=1/(1/3+1/4)
=1.7 hrs
1 hr 43 min
j
2006-10-11 09:21:36 · answer #1 · answered by odu83 7 · 0⤊ 0⤋
1/4 Wall in 1 hour. 1/3 wall in 1 hour. 3/12 + 4/12 = 7/12 of wall gets painted by both in 1 hour. Set up ratio 7/12 /1 equals 12/12 /X Solve for X and get 7/12 X =1. Next X = 12/7 hours which is 1 hour and 5/7 hours which is 1 hour and 42.86 minutes (5/7 x 60)
2006-10-11 16:47:38 · answer #2 · answered by Al Rosen 1 · 0⤊ 0⤋
one guy paints at 1wall/4hours, the other at 1 wall/3hours. Add their rates up, and you get 1/4 + 1/3 = 7/12 of a wall per hour
1 / (7/12) = 12/7 hours per wall = 1 and 5/7 hours = 1 hour 43 minutes
2006-10-11 16:32:49 · answer #3 · answered by Wing commander 3 · 0⤊ 0⤋
It depends how big the wall is and the size of the brushes used. Not to mention what the weather is like, if it is raining and the wall is outdoors it will take longer because the paint will run.
Then you have to allow the compulsary 10 minute break if they do go up to or beyond 4 hours, and what about toilet time?....................
2006-10-11 16:27:35 · answer #4 · answered by L D 5 · 0⤊ 0⤋
4/7 of 3 hrs or 3/7 of 4 hrs (same!) = 12/7 hrs
= approx 1 hr 43 mins
2006-10-11 16:26:57 · answer #5 · answered by DriverRob 4 · 0⤊ 0⤋
One in 4 one in 3. So it will be 2 or 1 and a half depending on how qick you are.
2006-10-11 16:25:14 · answer #6 · answered by helen p 4 · 0⤊ 0⤋
I had this question like last year lol it's like 1 hour 45 minutes or something.
2006-10-11 16:21:42 · answer #7 · answered by Anonymous · 0⤊ 0⤋
one hour and 43 minutes, but I can't show my work.
2006-10-11 16:26:48 · answer #8 · answered by imnotbtami 5 · 0⤊ 0⤋
how big is the wall ??
2006-10-11 16:24:50 · answer #9 · answered by venus 2 · 0⤊ 0⤋