SOLUTION: I am not sure how to begin setting this equation up. I know that it requires the d=r*t formula but what goes where and how do I solve it? Filling a tank. A water tank has an inl

Question 359042: I am not sure how to begin setting this equation up. I know that it requires the d=r*t formula but what goes where and how do I solve it?
Filling a tank. A water tank has an inlet pipe and a drain
pipe. A full tank can be emptied in 30 minutes if the drain
is opened and an empty tank can be filled in 45 minutes
with the inlet pipe opened. If both pipes are accidentally
opened when the tank is full, then how long will it take to
empty the tank?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate*Time=Volume
.
.
.
Let the pool volume be .
Calculate the fill rate,

Calculate the drain rate,

Calculate the time when both valves are open,

Substituting,

minutes

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