$A$ person standing between two parallel cliffs fires a gun and hears two echoes,the first echo after $1 \ s$ and the second echo after $3 \ s$. If the velocity of sound is $340 \ m/s$,the distance between the two cliffs is: (in $m$)
- A$340$
- B$680$
- C$1020$
- D$1360$
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