Vector Help, plane flying with wind speed?

Kris K

New member
The question directly from my book is,
An airplane is flying at an airspeed of 400 km/hr in a wind blowing at 40 km/hr toward the southeast.

In what direction should the plane head to end up going due east? What is the airplane's speed relative to the ground?

I know how to tell what direction the plane with wind speed affecting it, but i can't seem to work the problem backwards. Thanks for any help!
 
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