SOLUTION: If Jo takes 3 hours to paint a house and Sam takes 5 hours, how long do they take if they paint it together? Give an answer and briefly explain your reasoning.

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Question 893871: If Jo takes 3 hours to paint a house and Sam takes 5 hours, how long do they take if they paint it together? Give an answer and briefly explain your reasoning.
Found 3 solutions by kdonoho, MathTherapy, richwmiller:
Answer by kdonoho(1) About Me  (Show Source):
You can put this solution on YOUR website!
8 hours because you add their hours together

Answer by MathTherapy(10556) About Me  (Show Source):
You can put this solution on YOUR website!

If Jo takes 3 hours to paint a house and Sam takes 5 hours, how long do they take if they paint it together? Give an answer and briefly explain your reasoning.


highlight_green%281.875%29 hours, or 1 hour, 52 minutes, 30 seconds

You can do the check!! 



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Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/3+1/5=1/x
or
x/3+x/5=1
I prefer working with this
1/3+1/5=1/x
5/15+3/15=1/x
8/15=1/x
x= 15/8=1.875 hours or 112.5 minutes or 1 hr 52.5 minutes