95. Given that the volume of pool $M$ is 1.5 times the volume of pool $N$, there are three water pipes $A$, $B$, and $C$. Pipe $A$ alone can fill pool $M$ in 5 hours; pipe $B$ alone can fill pool $N$ in 5 hours; pipe $C$ alone can fill pool $N$ in 6 hours. If pipes $A$, $B$, and $C$ are opened simultaneously, $A$ continuously fills pool $M$, $C$ continuously fills pool $N$, and $B$ first fills pool $M$ and then fills pool $N$, such that both pools are filled at the same time. $B$ fills pool $M$ for $\qquad$ hours.
Reference answer: 15/8