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Let x be the distance between surface and bottom of mine in kilometers.
The temperature of the surface is and the temperature of the air at the bottom is .
The temperature increasing per one kilometer is .
The temperature increasing per one kilometer is .
Therefore, the above situation represent the equation is .
Solve the equation for x.
Subtract 18 from each side.
Divide each side by 10.
Cancel common terms.
.
The distance between surface and bottom of mine is 2 kilometers.
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