SOLUTION: it takes 4 hours to fill a tank it takes 6 hours to empty the tank how long dose it take to fill it if both vales are open

Question 359395: it takes 4 hours to fill a tank it takes 6 hours to empty the tank how long dose it take to fill it if both vales are open
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate*Time=Output
.
.
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Let the tank volume be .
Find the fill rate,

Find the drain rate,

Now find the time to fill the tank when both valves are open,

hours