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Barber's Problem (turn in this problem only)
A high speed train passes a station at full speed while sounding its horn. A person standing on
the platform hears the horn at 420 Hz as the train approaches and 300 Hz after it passes.
Assuming that the speed of sound is 343 m/s;
a. How fast is the train moving?
b. What is the frequency of the horn as observed from the train.

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