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Question

A man fires a gun and hears the echo from the cliff after 2 seconds. He walks towards cliff about a distance of 85 m and fires the gun again. He hears echo after 1.5 seconds. In this case, the velocity of sound in air is

A
85 m/s
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B
170 m/s
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C
340 m/s
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D
680 m/s
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