If x1, x2, . . ., xn and ${1 \over {{h_1}}}$, ${1 \over {{h_2}}}$, . . . , ${1 \over {{h_n}}}$ are two A.P..s such that x3 = h2 = 8 and x8 = h7 = 20, then x5.h10 equals :

Question

If x₁, x₂, . . ., x_n and ${1 \over {{h_1}}}$, ${1 \over {{h_2}}}$, . . . , ${1 \over {{h_n}}}$ are two A.P..s such that x₃ = h₂ = 8 and x₈ = h₇ = 20, then x₅.h₁₀ equals :