I need help with this kind of math problem.
Jack can clean the bathroom in 5 hours while Jill can clean the bathroom in 3 hours. How many minutes will it take them to clean if the bahtroom if they work together?
2007-08-22 07:05:42 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Also, can u explain how you got your answer? Thanks!
2007-08-22 07:07:07 · update #1
this should help:
http://www.purplemath.com/modules/printpage.cgi?path=/modules/workprob.htm
2007-08-22 09:06:22 · answer #1 · answered by vcas30 3 · 0⤊ 0⤋
Take x be the hrs Jack takes to clean the bathroom and Y be the hrs taken by Jill to clean the bathroom.
So average time is that they take to clean the bathroom is (5+3)/2=4
1 hr is 60 minutes so 4 hrs is 240 minutes.
Hope this is correct.I am not sure.
Thanks,
Preetha.
2007-08-22 14:16:32 · answer #2 · answered by preetha n 1 · 0⤊ 0⤋
I am not sure if this is right
add the two numbers, then divide by 2 for 2 people
which will be 4 hours times 60 minutes = 240 mins
2007-08-22 14:13:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋
1/5x + 1/3x = 1
Multiply both sides of the equation by 15
154(1/5x) + 15(1/3x) = 15(1)
3x + 5x = 15
Collect like terms
8x = 15
Divide both sides of the equation by 8
8x / 8 = 15 / 8
x = 15 / 8
x = 1 7/8 hours
That is one hour and seven eights minutes
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7/8 of a hour is
7/8(60) =
420 / 8
52.5 minutes
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add 52.5 minutes to 60 minutes
112.5 minutes
Jack and Jill working together can clean the bathroom in 112.5 minutes
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2007-08-22 15:07:22 · answer #4 · answered by SAMUEL D 7 · 1⤊ 0⤋
im not totally sure but i think it would be 180 minutes. since jill is the fastest cleaner, and she can do it in 3 hours, that is the fastest they will be able to clean it. 3 hours is the same as 180 minutes. i hope this is right
2007-08-22 14:15:46 · answer #5 · answered by puppy_love 3 · 0⤊ 0⤋