SOLUTION: 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?

Question 440803: 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?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

Sally can paint a house in 4 hours, and John can paint the same house in 6 hour

Let x represent the time for both of them to paint the house together

Question states*** Per hour the equalizer

  1/4 + 1/6 = 1/x

  3x + 2x = 12   |multiplying thru by 12x so as all denominators=1

     5x = 12

      x = 12/5 or 2.4hr Or 2 hour and 24 min 

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