[Physics] Resistance and permittivity

Question

I saw this formula in a book
RC = ρε
Can anyone tell me what is the significance of this formula or how is it derived?
The capacitance and the resistivity seem to be pretty much unrelated quantities but there seems to be a straightforward relationship between them.
When and where can I use this formula?

Answer 1

$R$ is given by: $$ R = \rho \frac{d}{A} $$ and $C$ by: $$ C = \epsilon \frac{A}{d} $$

Multiplying $R$ and $C$ gives us: $$ RC = \rho \epsilon $$

Capacitance and resistivity are unrelated, like Chemomechanics pointed out.