Problem $1$: In the chemical liquid storage process given below, the transfer function between the liquid level H and the volumetric liquid flow rate Q

The chemical liquid height is in cm$,$ the output flow is in liters per minute, and q is the flow rate constant.

$3)$ If a unit size step change is made in the outlet flow, what will be the change in the liquid height? Liquid Show the change in height by drawing H $($t$).$

a$)0$ minutes $,$ b$)20$ minutes $,$ c$)40$ minutes $,$ d$)60$ minutes $,$ e$)80$ minutes $,$ f$)100$ minutes.

NOTE : Explain the answer by drawing H$($t$).$