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**1. Homework Statement**

A train whistle sounds. As the train approaches, a stationary observer near the track hears the whistle at a frequency of 500 hertz. As the train recedes the observer hears the whistle at a frequency of 450 hertz. what is the speed of the train? v (sound) = 343 m/s

**2. Homework Equations**

Fa = f/(1-v(train)/Vs(Sound))

Fr = f/(1+v(train)/Vs(Sound))

**3. The Attempt at a Solution**

Vtrain = 18.05