A plane flies at 400 km/h [south 30 degrees east]. The wind is blowing from the east at 100 km/h. Find the resulting speed of the plane.
The Attempt at a Solution
I've drawn a diagram similar to this:
| \ 400 km/h
I thought this was just a simple question of finding the left side of the triangle, but I don't seem to get the answer. Any hints is greatly appreciated.
Thank you in advance.