A composite bar is made of two copper bars which are on either side of a steel bar; all bars with an area of cross-section equal to 1000 mm2. The bars have a load of 200 kN on them. The value of Young's moduli for copper and steel are 100 kN/mm2 and 200 kN/mm2 respectively. If the copper bar is 350 mm long and the steel bar is 490 mm long. calculate the relationship between the loads carried by the bars.