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A railway engine and a car are moving on...

A railway engine and a car are moving on parallel tracks in opposite directinos with speeds of `144km//hr` and `72km//h` respectively. The engine is continously sounding a whistle of frequency 500Hz. The velocity of sound in `340ms^(-1)`. Calculate the frequency of sound heard in the car when
(i) the car and engineare approaching one another,
(ii) the two are moving away from one another.

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