Relative Velocity: An airplane with an airspeed of 120 km/h has a heading of 30° east of north in a wind that is blowing toward the west at 30 km/h. What is the speed of the plane relative to the ground?
A. 90 km/h
B. 110 km/h
C. 140 km/h
D. 150 km/h
Answer: B
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