A observer is moving towards a source with speed 15 m/s. The source is moving with speed 5 m/s in the same direction. Air is blowing with speed 10 m/s from observer to source. If frequency of sound emitted is 325 Hz then frequency of sound heard by observer (velocity of sound in air = 330 m/s) in Hz is equal to.
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(335Hz)
V observer, air 
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