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## Homework Statement

a submarines sends sound waves and receives it after 4 seconds then goes under water 700 m and sends waves and receives it after 3 seconds he wants the depth of water

## Homework Equations

V=d/t

## The Attempt at a Solution

V=d/t V=x/2

then V=X-700/1.5 so x/2 = x-700/1.5 and X = 2800 is this right ?