`A(3, 4),B(0,0) and c(3,0)` are vertices of `DeltaABC.` If 'P' is the point inside the `DeltaABC`, such that `d(P, BC)le` min. `{d(P, AB), d (P, AC)}`. Then the maximum of `d (P, BC)` is.(where `d(P, BC)` represent distance between `P and BC)`.