SOLUTION: One clerk can file 12 folders per minute and a second clerk, 9. How long will it take them working together to file 672 folders?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: One clerk can file 12 folders per minute and a second clerk, 9. How long will it take them working together to file 672 folders?      Log On


   

Question 912818: One clerk can file 12 folders per minute and a second clerk, 9. How long will it take them working together to file 672 folders?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
12x+9x=672
21x=573
x=672/21
x=32 minutes