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A police car moving at 40 m / s chases a...

A police car moving at 40 m / s chases a thief running away at speed of 30 m /s. The track is perpendicular to a stiff cliff as shown. The police man blows a hom at 40 Hz. If sound has a speed of 340m / s, what is the beat frequency (in Hz ) heard by the thief?
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