6. There are two specifications of steel bars, A and B, and C. It is known that 2 bars of type A, 1 bar of type B, and 3 bars of type C are a total of 23 meters long; 1 bar of type A, 4 bars of type B, and 5 bars of type C are a total of 36 meters long. How long are 1 bar of type A, 2 bars of type B, and 3 bars of type C?