SOLUTION: if one man paints a wall in 30 minutes and another paints the same wall in 20minutes how long would it take if they both painted it.

Algebra ->  Rate-of-work-word-problems -> SOLUTION: if one man paints a wall in 30 minutes and another paints the same wall in 20minutes how long would it take if they both painted it.       Log On


   

Question 423962: if one man paints a wall in 30 minutes and another paints the same wall in 20minutes how long would it take if they both painted it.
Answer by linht117(37) About Me  (Show Source):
You can put this solution on YOUR website!
x= how long it takes to paint together
x/30 + x/20 = 1 wall
60(x/30) + 60(x/20) = 1(60) multiply by LCD and simplify
2x + 3x =60
5x=60
x=12 minutes