SOLUTION: Martha can rake the leaves in 3 hours. Her brother takes 7 hours. How long will it take if they work together?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Martha can rake the leaves in 3 hours. Her brother takes 7 hours. How long will it take if they work together?       Log On


   

Question 889890: Martha can rake the leaves in 3 hours. Her brother takes 7 hours. How long will it take if they work together?
Answer by harpazo(655) About Me  (Show Source):
You can put this solution on YOUR website!
Here is your equation:
1/3 + 1/7 = 1/x
Solve for x to find your answer.