Question: While you are driving on a straight road at (97 mathrm{~km} / mathrm{h}), a police car traveling in the opposite direction comes toward you with

While you are driving on a straight road at $97 \mathrm{~km} / \mathrm{h}$, a police car traveling in the opposite direction comes toward you with the siren blaring, and the frequency you hear is $310 \mathrm{~Hz}$. Starting when the two of you are $200 \mathrm{~m}$ apart, it takes you $3.00 \mathrm{~s}$ to pass the police car. What is the frequency of the siren?

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