A car traveling along a straight road has a velocity in $\text{m}/\text{s}$ represented by the graph of $v=f\left(t\right)$ on the interval $0\le t\le 12$, as shown. The time $t$ is in seconds. Divide $[0,12]$ into $n=2$ subintervals: $[0,6]$ and $[6,12]$. Estimate the displacement of the car on $[0,12]$ by assuming that the car travels at a constant velocity equal to the value of $v$ evaluated at the midpoint of each subinterval.