Can Physics hear my cry ?

The driver of a car travelling with a speed of 30 ms130 \text{ ms}^{-1} towards a hill sounds a horn of frequency 600 Hz.600\text{ Hz}. If the velocity of the sound in air is 330 ms1,330\text{ ms}^{-1}, then the frequency (in Hz\text{Hz}) of the reflected sound as heard by the driver is __________.\text{\_\_\_\_\_\_\_\_\_\_}.

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