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A driver in a car , approaching a vert...

A driver in a car , approaching a vertical wall notices that the frequency of his car horn , has changed form 440 Hz to 480 Hz , when it gets reflected form the wall . If the speed of the sound in are 345 m/s , then the speed of the car is :

A

54 km/hr

B

36 km/hr

C

18 km/ hr

D

24 km/ hr

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