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BITSAT 2019 Solved Question Paper

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Question : 6

Total: 150

Two trains are moving towards each other with 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)

600Hz
585 Hz
645 Hz
666 Hz

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