SOLUTION: If Susie can paint a house in 4 hrs and David can paint a house in 6 hrs. How long will it take them to paint it together? One answer that was given was 2hr and 24 min, but I'm no

Question 74314: If Susie can paint a house in 4 hrs and David can paint a house in 6 hrs. How long will it take them to paint it together? One answer that was given was 2hr and 24 min, but I'm not sure how they got it.
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
If Susie can paint a house in 4 hrs and David can paint a house in 6 hrs. How long will it take them to paint it together?
This is the way I was taught this, but I know there is another way to do this:
Susie can paint 1 house in 4 hrs, her work rate is:1/4
David caan paint 1 house in 6 hrs, his work rate is: 1/6
They both can paint 1 house in x hrs, their combined work rate is:1/x
:
Problem to solve:

Cross multiply, or flip both sides over and you have:

x=12/5 hrs.
x=2 and 2/5 hrs there are 60 minutes in an hour
x=2 hrs and (2/5)(60)min
x=2 hrs and 24 mins.
Happy Calculating!!!!
RELATED QUESTIONS
if sally can paint a house in 4 hrs, and john can paint the asame house in 6 hrs, how... (answered by checkley71,funmath)

If Sally can paint a house in 4 hours, and Tom can paint it in 6 hours, How long will it... (answered by Earlsdon)

Mary can paint a house in 4 hours. John can paint a house in 6 hours. How long will it... (answered by Edwin McCravy)

if anna can paint a house in 4 hours and joe can paint a house in 6 hours. how long will... (answered by nerdybill)

If bill can paint a house in 4 hours and joe can paint a house in 6 hours, how long would (answered by unlockmath,eric.schuh)

If Sally can paint a house in 4 hours and John can paint the same house in 6 hours. How... (answered by richwmiller,Earlsdon)

solve. Round to the nearest tenth of necessary Mr. Endicott, Mr. Bookout, and Mr.... (answered by Theo)

If a Home Depot worker can paint a house in 4 hours, and a Lowes worker can paint the... (answered by stanbon)

If Mary can paint a house in 4 hours and Dan can paint a house in 6 hours how long will... (answered by ewatrrr,josmiceli)