A hot fluid at an average temperature of 200 °C flow through a plastic pipe of 4 cm OD and 3 cm ID. The thermal conductivity of the plastic is 0.5 W/m² K, and the convection heat transfer coefficient at the inside is 300 W/m² K. The pipe is located in a room at 30 °C, and the heat transfer coefficient at the outer surface is 10 W/m2 K. calculate the overall heat transfer coefficient and the heat loss per unit length of the pipe?