Question:
A water tank can be filled by an inlet pipe in 9 hours. It
Last updated: 8/12/2022
![A water tank can be filled by an inlet pipe in 9 hours. It](https://media.kunduz.com/media/sug-question/raw/83540332-1660324377.3053102.jpeg?h=512)
A water tank can be filled by an inlet pipe in 9 hours. It takes 4 times as long for the outlet pipe to empty the tank. How long will it take to fill the tank if both pipes are open?