A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speeds of sound is 343 m/s, the frequency of the honk as heard by him will be :-

1. A. 1332 Hz
2. B. 1372 Hz
3. C. 1412 Hz
4. D. 1464 Hz

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