A train with a blowing whistle that has a frequency of 550 Hz is travelling at a speed of 80.0 km/h toward a railway crossing where a car waits behind the barrier. If the
speed of sound is 345 m/s, what is the frequency of sound that reaches the car as
the train approaches the crossing? Do not leave any spaces in between the numeric
answer and the unit of measurement. Make sure that your answer has the
appropriate number of significant digits.