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A gun is fired in a valley between two p...

A gun is fired in a valley between two parallel mountains. The echo from one mountain is heard after 2 second and from the other 2 second after the first echo. What will be width of valley? Speed of sound in air is `360 ms^-1`.

A

`500 m`

B

`680 m`

C

`1080 m`

D

`1200 m`

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