As per given by the question,
The given value is 220 L, i.e volume.
Now,
There is need to calculatea cube volume.
So,
Cube volume is calculated by multiplying the lenght cube .
That means,
Then,
The volume of the tank is 220 L.
So,
From the formula of volume,
Then,
Then, according to properties;
Then,
Now,
For the nearest 0.001,
Hence, the smallest possible inside length is 0.604.