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You are driving and pull over when you hear a fire-engine approaching. The difference between the...

You are driving and pull over when you hear a fire-engine approaching. The difference between the frequency you hear when the fire-engine is approaching and the frequency of the siren on the fire-engine is 47.3 Hz. The siren on the fire-engine has a frequency of 635 Hz. How fast is the fire-engine travelling? Enter your answer in m/s.

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