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A siren placed st a railway platform is ...

A siren placed st a railway platform is emitting sound of frequency `5 kH z`. A passenger sitting in a moving train `A` records a frequency of `5.5 kH z` while the train approaches the siren. During bis retum joumey in a differeat train `B` he records a frequency of `6.0 kHz` while approaching the same siren. Find the ratio of the velocity of train `B` to that of `operatorname(train) A`.

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