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Two trains are moving towards each other at speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz . the frequency of the whistle heard by a passenger in the second train before the train meets is (the speed of sound in air is 340 m/s )

A

600 Hz

B

585 Hz

C

645 Hz

D

666 Hz

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The correct Answer is:
D
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