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A train is moving at a speed of v = 108 km/h towards a person standing just next to the rails. The train blows a whistle for 7.0 s. What is the time duration for which the whistle is heard by this person? Assume that the train does not reach or cross the person until the end of whistle. Speed of sound in air is 350 m/s.

A. 6.4

B. 7.6

C. 245/38

D. 245/32

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Correct answer: (A) 6.4

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