The pilot of a plane measures an air velocity of 186 km/h south. An observer on the ground sees the plane pass overhead at a velocity of 102 km/h...

The pilot of a plane measures an air velocity of 186 km/h south. An observer on the ground sees the plane pass overhead at a velocity of 102 km/h toward the north. What is the velocity of the wind that is affecting the plane? Let north be positive. Answer in units of km/h.