The plot of a plane measures an air velocity of 165 km/h south. An observer on the ground sees the plane pass?

Question

overhead at a velocity of 145km/h toward the north. What is the velocity of the wind that is affecting the plane?

Answer 1

If airspeed is 165 km/h S and groundspeed is 145km/h N, then wind speed is 165+145 = 310km/h North.