can i get a good explanation , dont post the same answer as posted before because its wrong and if you do i will rate you bad

the correct answer is 25.4kW

Assume the pipe in the previous example has a 0.5cm thickness and 2m length and a thermal conductivity of the material k=47Wm1K. . The fluid on the inside exchanges heat with a fluid flowing on the outside of the pipe. Calculate the rate of heat transfer between the two fluids assuming a temperature of 400K for the fluid inside and 1000K for the outside fluid. On the outer side, the heat transfer coefficient can be assumed to be 250Wm2K1