A submarine (A) travelling at \( 18 \mathrm{~km} / \mathrm{hr} \) i...

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A submarine (A) travelling at \( 18 \mathrm{~km} / \mathrm{hr} \) is being chased along the line of its velocity by another submarine \( (B) \)
\( \mathrm{P} \) travelling at \( 27 \mathrm{~km} / \mathrm{hr} \). B sends a sonar signal of \( 500 \mathrm{~Hz} \)

W to detect \( A \) and receives a reflected sound of frequency \( v \), The value of \( v \) is close to
(Speed of sound in water \( =1500 \mathrm{~ms}^{-1} \) )
[JEE (Main) 2019]
(a) \( 504 \mathrm{~Hz} \)
(b) \( 499 \mathrm{~Hz} \)
(c) \( 502 \mathrm{~Hz} \)
(d) \( 507 \mathrm{~Hz} \)
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