# The temperature of the Earth's crust is a linear function of depth below the surface given by T(d) = 0.01*d + 20. And d is a function of speed s and time t given by d = s*t. If a descent under the...

The temperature of the Earth's crust is a linear function of depth below the surface given by T(d) = 0.01*d + 20. And d is a function of speed s and time t given by d = s*t. If a descent under the surface is made at 5 m/s, at what depth is the temperature 25 C.

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justaguide | Certified Educator

The temperature of the Earth's crust is a linear function of depth below the surface given by T(d) = 0.01*d + 20. And d is a function of speed s and time t given by d = s*t. If a descent under the surface is made at 5 m/s, the depth at which the temperature is 25 C has to be determined.

T(d) = 0.01*d + 20

25 = 0.01*d + 20

=> d = 5/0.01

=> d = 500

**The temperature is 25 C at a depth of 500 m.**