Geometry
posted by Sydney Rood .
A stunt airplane travels at N 62 E at a constant speed of 400 mi/hr. There is a 20 mi/hr wind blowing doe west. What is the planes actual speed?

Vp = 400mi/h @ 28 Deg.,CCW.
Vw = 20mi/h @ 180 Deg.,CCW.
X = 400*cos28 + 20*cos180 = 333.2 mi/h.
Y = 400*sin28 + 20*sin180 = 187.8mi/h.
V=sqrt((333.2)^2 + (187.8)^2)=382.5 mi/h = Actual speed of plane.