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Solve the given problem:
Problem: Two trains on separate tracks move toward each other. Train 1 has a speed of 135 km/h; train 2 a speed of 81.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz.
A- What is the frequency heard by the engineer on train 1?
Hz
Show all work, use additional paper if necessary.
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