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A person feels 2.5% difference of freque...

A person feels 2.5% difference of frequency of a motor-car horn. If the motor-car is moving towards the person and the velocity of sound is 320 m/s, then the velocity of motor car will be (approximately)

A

80 m/s

B

8 cm/s

C

800 m/s

D

8 m/s

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