Answer
Please see the work below.
Work Step by Step
We know that the balloon falls 20 meters in t seconds
$t=\sqrt{\frac{2y}{g}}$
We plug in the known values to obtain:
$t=\sqrt{\frac{2(20)}{9.8}}=2.0s$
The distance traveled by student is
$x=vt$
We plug in the known values to obtain:
$x=(2)(2.0)=4.0m$
