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a police van is travelling with speed of 30 m/s to catch a car that is running away from police with speed of 20 m/s.

a police van is travelling with speed of 30 m/s to catch a car that is running away from

police with speed of 20 m/s. If the siren of the police van has frequency of 580 Hz, what

frequency will be heard by the driver of car if the speed of the sound in air is 343 m/s

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