What will be the temperature in the mine at a depth of 1400 m in summer if the surface temperature is + 25 ° C

What will be the temperature in the mine at a depth of 1400 m in summer if the surface temperature is + 25 ° C, and in winter if the surface temperature is -25 ° C?

1) Determine the temperature in the mine in summer:
+ 25 ° C + 1400 m: 100 m × 3 ° C = + 25 ° C + 52 ° C = +77 ° C
2) Determine the temperature in the mine in winter:
-25 ° C + 1400 m: 100 m × 3 ° C = -25 ° C + 52 ° C = +27 ° C
Answer: The temperature in the mine is +77 ° C in summer and +27 ° C in winter.

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