Shake it to my Beats

A car is moving towards a wall with a velocity = \( 10 \text{ m/s} \). The car blows it's horn at a frequency of \( 240 \text{ Hz} \). A man is poking his head out of the car at that time too. If the speed of sound in air is \( 330 \text{ m/s} \), then what will be the frequency at which he will hear the beats?

Note:- Ignore the human hearing range.

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