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A siren placed at a railway platfrom is ...

A siren placed at a railway platfrom is emitting a sound of 5kHz . A passenger sitting in a moviing train A records a frequency of 5.5 kHz while the train A approaches the siren . During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren . What is the ratio of the velocity of train B to that of train A ?

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