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Statement of a problem № 3527

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A railway engine whistles as it approaches a tunnel, and the sound is reflected back by the wall of the rock at the opening. If the train is proceeding at a speed of 72 km/h and if the effect of the wind be neglected, find the ratio of the relative frequencies of the reflected and direct sounds as heard by the driver of the engine.

Solution:
A railway engine whistles as it approaches a tunnel, and the sound is reflected

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