Answer
$v_2 > v_1 > v_3$
Work Step by Step
When the gas flows faster, the pressure is lower, and the liquid will rise up to a higher level.
Point 2 has the highest level of the liquid, so the pressure must be the lowest. Therefore, $v_2$ is the fastest.
Point 3 has the lowest level of the liquid, so the pressure must be the highest. Therefore, $v_3$ is the slowest.
We can rank the gas speeds from largest to smallest:
$v_2 > v_1 > v_3$
