A siren placed at a railway platform is emitting sound of frequency...

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A siren placed at a railway platform is emitting sound of frequency \( 5 \mathrm{kHz} \). A passenger sitting in a moving train \( A \)
\( \mathrm{P} \) records a frequency of \( 5.5 \mathrm{kHz} \) while the train approaches the siren. During his return journey in a different \( \operatorname{train} B \) he
W records a frequency of \( 6.0 \mathrm{kHz} \) while approaching the same siren. The ratio of the velocity of train \( B \) to that of train \( A \) is
[IIT-JEE (Screening) 2002]
(a) \( 242 / 252 \)
(b) 2
(c) \( 5 / 6 \)
(d) \( 11 / 6 \)
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