We can rewrite this as:
$G(s) = \frac{40}{400(1 + \frac{10s}{400})} = \frac{0.1}{1 + 0.025s}$
This is a first-order system with a DC gain of 0.1 and a time constant of $\tau = \frac{1}{0.025} = 40$.
The corner frequency is $\omega_c = \frac{1}{\tau} = 0.025
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