answers:
2 & 2/5 hrs
24/5 hrs
5 hrs
3 hrs
2007-02-12 03:44:00 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Thank you everyone!
2007-02-12 03:56:37 · update #1
x/4 + x/6 = 1
12(x/4) + 12(x/6) = 12(1)
3x + 2x = 12
5x = 12
5x/5 = 12/5
x = 12/5
x = 2 2/5
x = 2 hours 24 minutes
- - - - - - - - - s-
2007-02-12 04:54:10 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
1
2007-02-12 03:58:22 · answer #2 · answered by Slay Specialist 3 · 0⤊ 0⤋
1
2007-02-12 03:47:25 · answer #3 · answered by christian j 1 · 0⤊ 1⤋
Add their speeds which are reverse of the time taken for a job. So, in this case, if both of them work together on one job, it will take: 1/4 + 1/6 = 10/24 and the reverse of that will give the time. 24/10 hours is 2 hrs. 24 minutes. So, first answer is correct.
2007-02-12 03:54:54 · answer #4 · answered by Swamy 7 · 0⤊ 0⤋
Sam 4hr; Jay 6hr
Sam can paint 1/4 house in 1hr
Jay " " 1/6 " " 1hr
Sam and Jay paint (1/4+1/6) house in 1hr
= 0.42 house in 1 hr
takes how long to paint whole house?
1 = ?
0.42 = 1 hr
1/0.42 = 2.3 hr
takes 2 hr 18 min
2007-02-12 04:04:25 · answer #5 · answered by Alju10 1 · 0⤊ 0⤋
painting a house can be imagined to be like covering a certain fixed distance "x".thus speed of Sam is "x/4" and speed of Jay is "x/6".when both would do their speeds will add to "5x/12".thus the time taken will be equal to "x/5x/12=12/5 or 2 & 2/5 hours.
2007-02-12 04:08:18 · answer #6 · answered by Abhi 1 · 0⤊ 0⤋
Sam paints 1/4 of the house in an hour. Jay paints 1/6 of the house in an hour. So together they can do ??? of the house in an hour (add the fractions). This means it takes them ??? time to do the house.
You can do it!
2007-02-12 03:54:16 · answer #7 · answered by Anonymous · 0⤊ 1⤋
5 hours
2007-02-12 03:51:16 · answer #8 · answered by threeboysmamma 3 · 0⤊ 0⤋
You have to solve (H/4)+(H/6)=1 where H is the number of hours and 1 is the total (complete job). The answer is 2.4.
2007-02-12 03:52:32 · answer #9 · answered by jonmm 4 · 1⤊ 0⤋
2 & 2/5 hours
2007-02-12 03:51:03 · answer #10 · answered by Anonymous · 0⤊ 0⤋