Multiple choice question XXXIX — task. Science CBSE, Class 9.

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An observer stands at a distance of

$850\ m$ from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of

$350\ ms^{−1}$ in air?

$6.89\ s$
$4\ s$
$2.43\ s$
$4.86\ s$

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