An airplane has a speed of 600 km h

−1
with respect to air. It has to fly a distance of 800 km
northward. In what direction should it fly if a steady wind is blowing at a speed of
120 km h
−1
from the west? What will its speed with respect to the ground be? Draw the
relevant diagram for your calculations.

http://www.google.com/imgres?q=vector+airspeed+wind&um=1&hl=en&safe=off&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1135&bih=730&tbm=isch&tbnid=UXoQUzYa6d6f7M:&imgrefurl=http://entnemdept.ufl.edu/walker/ufbir/chapters/chapter_01.shtml&docid=MB9AKoVbXWmpBM&w=500&h=317&ei=GBtFTorIG4iGsgKR5KiSCA&zoom=1

is an example of the diagram.