please help with the question. including the steps

A 5mm by 7mm rectangular metallic chip and 0.8mm thick is mounted on a plastic substrate with its front surface cooled by a synthetic liquid flowing over it. Electronic circuits in the back of the chip generate heat at a rate of 10 watts that must be transferred through the chip. The thermal conductivity of silicone is 140W/(mK). State at least one assumption and determine the following: i) Draw a schematic diagram representing the device set up. ( 3 marks) ii) Calculate the temperature difference between the front and back surfaces of (7 marks) the chip. [10 Marks]