How can I make a transfer function with variable parameters in simlunk?

There is a model with a variable parameter:

G(s) = N/[(s+1/N) (s+10)]

Parameter “N” is variable, N=30 and at the 5th second a step function increases the value of N to 60. I don’t know how to define this model in "transfer function block” in simulink? What I should write for numerator coefficients and denominator coefficients?

Answer 1

[Arkadiy Turevskiy]

Here is how to implement 1/(s+N):