Скачать или смотреть , , A man standing between two cliffs hears the first echo of a sound after 2 sec and the second ...

, , A man standing between two cliffs hears the first echo of a sound after 2 sec and the second echo 3 sec after the intial sound. If the speed of sound be 330  m / s, the distance between the two cliffs should be:
(1) 1650  m
(2) 990  m
(3) 825  m
(4) 660  m,

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