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In drilling world's deepest hole it was ...

In drilling world's deepest hole it was found that the temperature T in degree celcius, x Km below the earth's surface was given by ` T=30 + 25(x-3), 3 le x le 15`. At what depth will the temperature be between ` 155^(@)C and 205^(@)C`?

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The correct Answer is:
Between `9*8` m and `13*8`m.
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