22. There are two candles, $A$ and $B$, of equal length. $A$ can burn for 2 hours, and $B$ can burn for 3 hours. After $A$ and $B$ are lit simultaneously for $t$ hours, the part of $A$ that has burned and the part of $B$ that has not burned are of equal length, then $t=(\quad)$.
A. $\frac{3}{2}$
B. $\frac{4}{3}$
C. $\frac{5}{4}$
D. $\frac{6}{5}$
Reference answer: D