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While drilling a hole in the earth, it w...

While drilling a hole in the earth, it was found that the temperature `(T^(@)C)` at x km below the surface of the earth was given by T = 30 + 25(x - 3), when `3le xle15`.
Between which depths will the temperature be between `200^(@)C` and `300^(@)C`?

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Verified by Experts

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