Question

A helicopter flies south at 185 km/h relative to the air. The wind is blowing 60.0 km/h to the west compared with the ground. What is the helicopter's speed to an observer on the ground?

Answer 1

In case you still need help. Did you know that you can use Pythagoras' theorem to add perpendicular vectors, just like with sides of a right-angle triangle?

Answer 2

Oh okay I didn't know that. :)