Q .     A man is standing unsymmetrically between two
mountains. He fires a gun and hears the first echo after
`1.5 s` and the second echo after `2.5 s`. If the speed of
sound is `340` m/s, what is the distance between the
mountains?

BITSAT 2016
A

`340m`

B

`410m`

C

`640m`

D

`680m`

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