If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for?

Question

How do you answer this? Hours and minutes please! Please show work.

Sorry!

take for.... them to paint the house together?

Answer 1

First of all, it will take John 6 hours to paint the house because he's having to fix all the mistakes that Sally made. It will also take him longer because while Sally was busy painting the house, John was getting blitzed out of his mind on Captain Morgan's.
Not to mention the fact that the neighbors are cutting the yard next door and they are blowing grass clippings on the still wet east wall of the house. So it may actually take John an extra half hour after he's through beating the tar out of his next door neighbor with his Big Bertha.
Oh, wait, NASCAR is on today, too. Better make that more like 9 hours for John, because he's worse than Sally with her Oprah and Dr. Phil double bill every afternoon, following the "turd lightning" UPS car around the track for 300 freakin' laps.

Answer 2

Sally: 1 house in 4 hours (1/4 houses per hour)
John: 1 house in 6 hours (1/6 houses per hour)
Together: 1/4 + 1/6 = 5/12 houses per hour

( 5/12 houses per hour ) x ( N hours ) = 1 house
5/12 x N = 1
N = 12/5 hours
N = 2 hours and 2/5 hours
N = 2 hours and 24/60 hours

N = 2 hours and 24 minutes

Answer 3

if you want to know how long it takes the two of them to paint the house:

after 2 hours, sally is half done, and john is 1/3 done, so the house is 83 1/3 % done.

(50% + 33 1/3 % = 83.33%)

so 2 / 83.33 = x / 100

solve for x gives us 2.40 hrs, which is 2 hrs. 24 minutes.


update: quite a few others got the right answer sooner. this IS the right answer, so now you know what to do.

Answer 4

Set up the equation like this:
1/4 + 1/6 = 1/x
Multiply everything by the common denominator, 12x, you get:
3x + 2x = 12
5x = 12
x = 12/5 or 2.4 hours which is 2 hours 24 mins.

Answer 5

Sally can do 1/4 of the house per hour, and John can do 1/6 of the house per hour.

if x = the number of hours to do the job if both help then

1/4x + 1/6x = 1

3/12x+2/12x=1

5/12x = 1

x = 12/5 hours

x = 2 2/5 hours or 2 hours and 24 minutes

Answer 6

see sally uses 1 hr to paint 1/4th of house n john uses 1 hr to paint 1/6th of house so sally n john will 2gthr take a time =1/(<1/4>+<1/6>) hrs to paint the whole house tht =2hrs24mins

Answer 7

I believe what he is trying to say is how long would it take if they worked on painting the house together.

Answer 8

Sally's means 4
Jonh means 6
just make an equation like

4X1+6X2=10

then just supose X1 = 0
6X2=10
X2=5/3

Then resolve for X2=0
4X1=10
X1=5/2

that means that: 5/3+5/2=25/6

25/6= 4.16 Hrs

That means 4 Hrs and a cofeee break :D

Answer 9

Sally works 1/3 more efficient than John.
3 hours or no answer?
Wow I feel stupid.

Answer 10

i am assuming that you want to know how long it would take for the house to get painted... in my opinion it would be 4 hours cause thats when sally got it done... why would john need to paint it then ?? it would be finished LOL