SOLUTION: One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?      Log On


   

Question 433612: One pipe can fill a tank in 20 minutes, while
another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
x%281%2F20+%2B+1%2F30%29+=+1
<==> x%281%2F10%29%281%2F2+%2B+1%2F3%29+=+1
<==> %28x%2F10%29%285%2F6%29+=+1
<==> x = 12 minutes.