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A man stands at a distance of 255 m from a cliff . He fires a gun and hears the echo after 1.5 seconds . What is the velocity of sound ?

$(a)\;330\;ms^{-1}\qquad(b)\;340\;ms^{-1}\qquad(c)\;320\;ms^{-1}\qquad(d)\;335\;ms^{-1}$

Answer : $\;340\;ms^{-1}$
A man stands at a distance of 255 m from a cliff . He fires a gun and hears the echo after 1.5 seconds .
The velocity of sound is $\;340\;ms^{-1}$