A man is standing between two parallel cliffs and fires a gun. If he hears first and second echos after 1.5 s and 3.5 s respectively, the distance between the cliffs is (velocity of sound in air = 340 ms'1)

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A man is standing between two parallel cliffs and fires a gun. If he hears first and second echos after 1.5 s and 3.5 s respectively, the distance between the cliffs is (velocity of sound in air = 340 ms'1)