A man sets his watch by a whistle that is $2\, km$ away. How much will his watch be in error. (speed of sound in air $330\, m/sec$)
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(d) Time lost in covering the distance of $2\, km$ by the sound waves
$t = \frac{d}{v} = \frac{{2000}}{{330}} = 6.06\,sec \approx 6\, sec$
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