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As a train approaches a ringing crossing gate, Stacey, a passenger on the train, hears a frequency of 440 Hz from the bell. As the train recedes, she hears a frequency of 410 Hz. How fast is the train travelling?

a. 12 m/s

b. 15 m/s

c. 13 m/s

d. 18 m/s

e. none of the above

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