The frequency of a whistle of the engine...

The frequency of a whistle of the engine of an express train moving with 20 m/s appears as 500 Hz to a car driver moving with the velocity 15 m/s. The velocity of the sound in air is 335 m/s. If the train and car are moving in opposite directions towards each other, then the frequency of the whistle is

A

557.9 Hz

B

563.4 Hz

C

450 Hz

D

443.6 Hz

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