A stone is dropped into a well of depth ...

A stone is dropped into a well of depth `80 m`. Splash of sound is heard after `4.25 sec`. If `g=10ms^(-2)`, velocity of sound in air is A) `300 ms^(-1)`; B) `360 ms^(-1)`; C) `320 ms^(-1)`; D) `400 ms^(-1)`;

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