solve in detail I need to d to understand the steps

The liquid level in an open tank modeled by a first order transfer function (see Figure) with gain K=0.4min/ft2 and time constant =2min is operating at a steady state inflow (q) and outflow (q0) of 50ft3/min. The area of the tank is 5ft2 and the level h at steady state is 20ft. At r=0, 5f3 of water is rapidly added from a barrel manually by an operator, which is equivalent to an impulse disturbance in q, to the tank. a) Derive the response of the level in the tank vs. time and determine the level at t=0,2 and 10min. Note that you will need to use the deviation variables in the transfer function solution. Assume constant density. Impulse disturbance =A(t) qn=Rh