The driver of car travelling with a speed 30 meter/sec. towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s the frequency of reflected sound as heard by the driver is
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A
When the sound is reflected from the cliff, it approaches the driver of the car. Therefore, the driver acts as an observer and both sources (car) and observer are moving.
In this case, the apparent frequency heard by the driver (observer),
Given, 
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