A plane flies at 220 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 2.8 x 105 m/h south. What is the velocity of the wind that affects the plane?

Answer 1

220 km/hr = 2.20 * 10^5 m/hr
So, there must be a headwind of 2.8-2.2 = 0.6 * 10^5 m/hr.

That is, a wind blowing north at 60 km/hr