I was never really able to solve this problem.

Can you help me?

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 both of them to paint the house together?

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- Aug 28th 2010, 01:58 PMlightstevooAlgebra Word Problem Easy
I was never really able to solve this problem.

Can you help me?

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 both of them to paint the house together? - Aug 28th 2010, 02:02 PMmr fantastic
- Aug 28th 2010, 02:06 PMArchie Meade
If they were painting different houses at the same time,

Sally will have painted one and a half houses in 6 hours,

while John will have painted one.

Hence, they will have painted two and a half houses in 6 hours, while painting at the same time.

That's 5 houses in 12 hours.

So, it will take a fifth of that time to paint one house, working together. - Aug 28th 2010, 02:08 PMlightstevoo
yea thanks i got it!

1/4 + 1/6 = 1/x

5 = 12/x

x=12/5

x= 2.4 hours

which is aprproxamately 2 hours and 24 minutes!