If PQ is a function f (x) = LNX, X belongs to any two different points on the image of [2,5], then the range of the slope of PQ is?

If PQ is a function f (x) = LNX, X belongs to any two different points on the image of [2,5], then the range of the slope of PQ is?

The derivation of F (x): F '(x) = 1 / x, ∵ x ∈ [2,5], ∵ 1 / X ∈ [1 / 5,1 / 2], that is, the range of slope passing through the point on f (x) is: [1 / 5,1 / 2], but since P and Q are two different points, ∵ K (PQ) > 1 / 5, and K (PQ)