A person fires a gun standing at a distance of 55m from a wall. If the speed of sound is 330 m/sec, find the time for an echo to be heard

as we know,
time = distance travelled / speed
here distance will b 110m , because the sound will go n return. so 55+55=110 m
t = d/s
=> 110/330
=>1/3 = 0.33 secs

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