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 ->  Percentage-and-ratio-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 891779: 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 josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
The rate for filling with both pipes is the sum of their rates.
Not knowing the time to fill the tank with both pipes at the same time, you want the reciprocal for:
1%2F20%2B1%2F30=1%2Fx.