A road runs parallel to a vertical cliff at a distance (IV of \( 495 \mathrm{~m} \) as shown in ...

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A road runs parallel to a vertical cliff at a distance
(IV of \( 495 \mathrm{~m} \) as shown in the figure. A car standing at A blows the horn and the driver of the car hears the echo after \( 3 \mathrm{~s} \). But a person standing at B hears the sound of horn twice within an interval of \( 2 \mathrm{~s} \). Explain why the person at \( B \) heard the sound twice. Also find the distance between the car and the person.
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