SOLUTION: If Sally could 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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Question 311429: If Sally could 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 ? Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! Painting of the house is 1 job for each of them.
sally does it in 4 hours
so she does 1/4 of the job in 1 hour.
..
John does the job in 6 hours
so he does 1/6 of the job in 1 hour
.
together they do 1/6 +1/4 of the job in 1 hour.
=5/12
5/12 of job they do in 1 hour.
1 job they do in 12 /5 hours
=2.4 hours
