One train is approaching an observer at rest and another train is receding from him with the sam...

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One train is approaching an observer at rest and another train is receding from him with the same velocity \( 4 \mathrm{~m} / \mathrm{s} \). Both trains blow whistles of same frequency of \( 243 \mathrm{~Hz} \). The beat frequency in \( \mathrm{Hz} \) as heard by the observer is (speed of sound in air \( =320 \mathrm{~m} / \mathrm{s} \) )
(a) 10
(b) 6
(c) 4
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