A train sounds its whistle as it approaches and leaves a station.An man at the station measures a frequency of 200 Hz as the train approaches and a frequency of 180 Kz as the train leave.Find the speed of the train. Speed of the sound is given as 340 m/s?

A train sounds its whistle as it approaches and leaves a station.An ma

1.	A train sounds its whistle as it approaches and leaves a station.An man at the station measures a frequency of 200 Hz as the train approaches and a frequency of 180 Kz as the train leave.Find the speed of the train. Speed of the sound is given as 340 m/s?
A.	17.89 m/s
B.	19.89 m/s
C.	16.91 m/s
D.	17 m/s
Answer» B. 19.89 m/s