Two cars \( \mathrm{A} \) and \( \mathrm{B} \) are moving in the same direction with speeds \( 3...

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Two cars \( \mathrm{A} \) and \( \mathrm{B} \) are moving in the same direction with speeds \( 36 \mathrm{~km} / \mathrm{hr} \) and \( 54 \mathrm{~km} / \mathrm{hr} \) respectively.
\( P \)
\( \mathrm{Car} \mathrm{B} \) is ahead of A. If A sounds horn of frequency
W \( 1000 \mathrm{~Hz} \) and the speed of sound in air is \( 340 \mathrm{~m} / \mathrm{s} \), the frequency of sound received by the driver of car B is :
(1) \( 928.57 \mathrm{~Hz} \)
(2) \( 984.84 \mathrm{~Hz} \)
(3) \( 946.37 \mathrm{~Hz} \)
(4) \( 938.47 \mathrm{~Hz} \)
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