A bus traveling on a highway at the speed of 35 ms blows a, Ask an Expert

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A bus traveling on a highway at the speed of 35 m/s, blows a horn with a frequency of 1200 Hz. What frequency is heard by a passenger in a car which is approaching the bus from the opposite direction at 45 m/s. (Assume the speed of sound in air is 345 m/s)

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