Question

A plane is travelling 20km/hr heading north while the wind velocity is 60km/hr north 30 degrees east, what is the distance travelling by the plane after 2 hrs

Answer 1

I quess you mean the direction the wind is going instead of where it is coming from. If not reverse the wind components I use.
Vnorth = 20 + 60 cos 30 = 72
Veast = 60 sin 30 =30
speed = sqrt (72^2 + 30^2) = sqrt (6084) = 78
78 * 2 = 156 km