The thermal conductivity of a substance will be measured in a lab using a device

Question

The thermal conductivity of a substance will be measured in a lab using a device , the side view of which is shown below. The device consists of three solid cylindrical parts that can be perfectly inserted into an insulating solve. The cylinder of unknown conductivity is placed in the middle, i.e. sandwiched between the our cylinders of known conductivity. These outer cylinders are made of stainless steel k = 15.1 W(m - K) The heat loss through circumferential surface is negligible. On the left side of the device, a heater is installed to give a constant heat rate. Temperature points A, B, and Measured using thermo couples. At steady - state, the temperature at points A, B, and C are 79, 70, and 40 degree C, respectively. Determine the thermal conductivity of the substance of interest.

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Sorry, i cant read the problem. Its kinda blurry

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