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A train moving with a velocity v is pass...

A train moving with a velocity v is passing a station. A passenger standing on the station notices that the whistle emitted by the train changes its frequency by 50 Hz when it passes him. Given that the frequency of the whistle when the train is at rest with respect to the passenger is 500 Hz and the velocity of sound in air is 330 m/sec, the velocity of the train is

A

8.25 m/sec

B

17.5 m/sec

C

35 m/sec

D

30 m/sec

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