A man standing in front of a wall produces a sound and hears an echo after 3s.
He walks ‘x’ m away from the wall and produces the same sound. Now he
hears an echo after 5.25s. Calculate the distance he walked away from the
wall. (Speed of sound in air is 340 m/s)
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In begining he stand at 510 metre away now in second case he stand at 892.5 metre now he go away from its 1 place to 2 place at a distance of 382.5 metre
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