SOLUTION: By checking work records, a plumber finds that Raul can plumb a house in 48hr. Mira can do the same job in 36hr. How long would it take if they worked together?

Question 452536: By checking work records, a plumber finds that Raul can plumb a house in 48hr. Mira can do the same job in 36hr. How long would it take if they worked together?
Found 2 solutions by Alan3354, MathLover1:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
change to how much they do per hour
Raul does 1/48 of the job per hour.
Mira does 1/36 per hour
Now you can add them
Together they do 1/48 + 1/36 = 36/1728 + 48/1728 = 84/1728 per hour
--> 1728/84 hours per job
= 144/7 hours per job
=~ 20.57 hours

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
Raul can plumb a house in .....->........rate is
Mira can plumb a house in .....->........rate is
now find the rate if they work together:

........ multiplying each term by common denominator , you got

.which is approximately

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