Answer
We can rank the plots according to the estimated age of the universe:
$3 \gt 2 \gt 1$
Work Step by Step
$H = \frac{\Delta v}{\Delta r}$
We can use the slope of each line to find $H$ for each graph.
$H_1 \gt H_2 \gt H_3$
We can use each value of $H$ to estimate the age of the universe:
$T = \frac{1}{H}$
Note that $T$ decreases as $H$ increases.
We can rank the plots according to the estimated age of the universe:
$3 \gt 2 \gt 1$
