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You are standing on the sidewalk and hear an ambulance siren at 500 Hz when the...

You are standing on the sidewalk and hear an ambulance siren at 500 Hz when the ambulance is approaching and at 400 Hz when the ambulance is going away from you. How fast is the ambulance moving? (Note: the speed of sound is 343 m/s).

a.) 38.1 m/s

b.)343 m/s    

c.)58.6 m/s

d.)49.3 m/s

e.)12.2 m/s

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