$1\mathrm{.}3\mathrm{.}2.$ The equation $k(d\frac{Q}{d}t)+Q(t)=I(t)$ has been used to describe the response of streamflow to a constant rate of precipitation continuing indefinitely on a watershed. In this case, let $I(t)=1$ for $t>0,$ and $Q(t)=0$ for $t=0.$ Solve the differential equation and plot the values of $I(t)$ and $Q(t)$ over a $10-$hour period if $k=2h.$