If x 1 , x 2 , ….., x n and 2 1 11 1 , ,….. h h h n are two A.P’s such that x 3 = h2 = 8 and x 8 = h7 = 20, then x 5 . h10 equals

If $x_{1}, x_{2}, \ldots ., x_{n}$ and $\frac{1}{h_{1}}, \frac{1}{h^{2}}, \ldots . . \frac{1}{h_{n}}$ are two A.P’s such that $x_{3}=h_{2}=8$ and $x_{8}=h_{7}=20$, then $x_{5} . h_{10}$ equals.