Question

A train is moving parallel and adjacent to a
highway with a constant speed of 22 m/s. A
car, at time t0, is 21.5 m behind the train,
traveling in the same direction as the train
at 43 m/s, and accelerating at 5 m/s2. The
train’s whistle blows at a frequency 430 Hz.
At the moment t0, the car’s driver hears a
whistle from the train.
What frequency does the car’s driver hear?
The speed of sound in air is 343 m/s.
Answer in units of Hz