Here is the problem which I am struggling on, please help me!
Problem: As you stand near a railroad track, a train passes by at a speed of 30.9 m/s while sounding its horn at a frequency of 215 Hz.
Part A: What frequency do you hear as the train approaches you and what frequency while it recedes?
I need help to solve the above problem and take the speed of sound in air to be 341 m/s.