in drilling worlds deepest hole it was found that the temperature T in degree celcius at x km below the surface of the earth was =30+25(x - 3), 3 less than x less than 15. at what depth will the temperature lie b/w 200^{o}C and 300^{o}C.

**Given,**

Here, we have to find *x* such that T lies between 200 and 300.

Hence, the required depth lies between 9.8 km and 13.8 km.

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