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Two cars X and Y are approaching each ot...

Two cars X and Y are approaching each other with velocities 36km/h and 72 km/h respectively. The frequency of a whistle sound as emitted by a passenger in car X, heard by the passenger in car Y is 1320 Hz. If the velocity of sound in air is 340 m/s, the actual frequency of the whistle sound produced is __________Hz.

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