When at rest two trains have sirens that emit a frequency, Physics

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When at rest two trains have sirens that emit a frequency

When at rest, two trains have sirens that emit a frequency of 300Hz. The trains travel toward one another and toward an observer stationed between them. One of the trains moves at 34.0 m/s, and the observer hears a beat frequency of3.1 beats per second. What is the speed of the second train, which travels faster than 34.0 m/s?

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Physics: When at rest two trains have sirens that emit a frequency

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