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A pedestrian standing on the sidewalk heard a frequency of 835 HzHz when an ambulance is...

A pedestrian standing on the sidewalk heard a frequency of 835 HzHz when an ambulance is travelling away from him with a speed of 30.0 m/sm/s .  

Speed of the sound in air = 343 m/s

a)What is the frequency of the ambulance's siren?  

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 950 HzHz . What is the speed of the car?

Express your answer using three significant figures.

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