A passenger is on an airplane traveling 30 degrees south of due west at 130 m/s with respect to the air. The air is moving with a speed of 34.0 m/s with respect to the ground due north. What is the airplane's speed with respect to the ground?
a) 100 m/s
b) 120 m/s
c) 150 m/s
d) 170 m/s