posted by Joel .
An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane.
a. 1/3 >Vplane
Please explain how to find this- I thought I took 120-40 = 80 but D doesn't seem like the right answer