I did not understand how to get the current in and the voltage across the R2 branch of Figure 1869.I NEED help to figure how solve this problem? Thank you

Use the superposition theorem to find the current in and the voltage across the R2 branch of Figure 1869.

FIGURE 18-69 2 V 1.0 kn 1.0 km 2.2 km 1.0 km 3 V 2.2 km