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A train approaching a hill at a speed of...

A train approaching a hill at a speed of 36 kmph sounds a whistle of frequency 500 Hz when it is at a distance of 1 km. A wind blows at 36 kmph in the direction of the motion of the train. Find (i) the frequency of the whistle as heard by an observer on the hill, (ii) the distance from the hill at which the echo from the hill is heard by the driver and its frequency. Velocity of sound `= 1200 kmph`

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The correct Answer is:
515 Hz, 941.7 m, 532 Hz
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