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stationary police car emits a sound of frequency 1200 Hz that bounces off of a car...

stationary police car emits a sound of frequency 1200 Hz that bounces off of a car on the highway and returns with a frequency of 1280 Hz . The police car is right next to the highway, so the moving car is traveling directly toward or away from it.

Part A: How fast was the moving car going?

Part B: Was the moving car moving towards or away from the police car?

Part C: What frequency would the police car have received if it had been traveling toward the other car at 18.0 m/s ?

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