Consider two insulated tubes with air flowing steadily through them. The flow rate and temperature of the air are 0.1 kg/s, 20 \(^{\circ}\text{C}\) in tube 1 and 0.2 kg/s, 25 \(^{\circ}\text{C}\) in tube 2.
If the two streams are allowed to mix adiabatically, the steady-state temperature of the mixed stream is ______ \(^{\circ}\text{C}\) (rounded off to one decimal place).
Assume a constant \(C_p\) for air.