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 ?

Question

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