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Two identical police vehicles are moving at different speeds in opposite directions on the same direction. Their sirens emit at a frequency of 1000 Hz

Two identical police vehicles are moving at different speeds in opposite directions on the same direction. Their sirens emit at a frequency of 1000 Hz and have a power of 10 W. The policeman in vehicle 1 measures a beat frequency of 220 Hz while the policeman in vehicle 2 measures a beat frequency of 217 Hz.
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