Easy# Resistors in Series

EANDM-SFZ7YJ

The figure below shows a battery connected to two resistors. The battery voltage $\Delta V =9.0 \:\rm V$, $R_1 = 120 \Omega$ and $R_2 = 240 \Omega$.

What is the voltage difference, $\Delta V_{AC}$, between the points $C$ and $A$?