To find ground speed we, for the beginning will find projections for vector of ground speed.
It'll be
V(grx)=V(plx)+V(wx)
V(gry)=V(ply)+V(wy),
where V is for velocity,
gr - ground
pl - plane,
w - wind.
x,y - for coordinates, where x- from W to E and y - from S to N.
V(plx)=V(pl)*sin20.
V(wx)=V(w)*sin20.
The same for y, but with cosinuses.
So,
V(gr)=(V(grx)^2+V(gry)^2)^-0.5.
V(grx)=47.9
V(gry)=72 kmh
V(gr)=88 kmh
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