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A person P is 600 m away from the statio...

A person P is 600 m away from the station. When train is approaching station with 72 km/h, it blows a whistle of frequency 800 Hz when 800 m away from the station. Find the frequency heard by the person. Speed of sound = 340 `ms^-1`.

A

800 Hz

B

839.5 Hz

C

829.5 Hz

D

843.5 Hz

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