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A commuter train blows its, 150 Hz, horn as it approaches a crossing on a day that the speed of sound is 330 m/s. A

A commuter train blows its, 150 Hz, horn as it approaches a crossing on a day that the speed of sound is 330 m/s. A person waiting at the crossing hears the train blow its horn and the observer the sound to be 208 Hz. What is the speed of the train as it is approaching?

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