A railroad train is traveling at 30.0 m/s in still air. The frequency of the note emitted by the train whistle is262 Hz. The speed of sound is 344 m/s.
A: What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and approaching the first?
B: What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and receding from the first?