How would I go about solving this mechanics/gravity problem?

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I've set out suvat and tried to find an equation for the different heights but I am totally lost.

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Let
$\qquad y_1(t)$=vertical distance of first paratrooper from helicopter, and
$\qquad y_2(t)$=vertical distance of second paratrooper from helicopter.

Difference in height between paratroopers at time $t \;(>2)$ is $$y_1(t)-y_2(t)=\frac 12 g(t+2)^2-\frac 12 gt^2=\color{red}{2g(t+1)}$$

Distance of first paratrooper as observed by second paratrooper increases linearly with time.