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A pedestrian standing on the sidewalk heard a frequency of 845 Hz when an ambulance is...

A pedestrian standing on the sidewalk heard a frequency of 845 Hz when an ambulance is traveling away from him with a speed of 45.0 m/s. Speed of sound in air = 343 m/s

A) what is the frequency of the ambulance siren? Express your answer using three significant figures.

B) Then the ambulance stopped for a few seconds while sounding the siren. A driver in a car that is coming towards the ambulance heard a frequency of 995 Hz. What is the speed of the car.

Express your answer using three significant figures.

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