問題詳情

57. A police car chases fugitives on the highway at 144 km/hr, its siren emitting sound at a frequency of 500 Hz. What frequency isheard by a passenger in a car traveling at 108 km/hr in the opposite direction as the police car and car approach each other?Assume the speed of sound in the air is 345 m/s.
(A) 420 Hz
(B) 495 Hz
(C) 545 Hz
(D) 595 Hz
(E) 625 Hz

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