The pilot of a plane measures an air velocity of 151 km/h south. An observer on the ground sees the plane pass overhead at a velocity of 119 km/h...

The pilot of a plane measures an air velocity of151 km/h south. An observer on the groundsees the plane pass overhead at a velocity of119 km/h toward the north.What is the velocity of the wind that isaffecting the plane? Let north be positive.Answer in units of km/h.