Calculate the value of the transverse shear stress at the neutral axis x-x and at the top of the web

Question

An 1-beam with the following dimensions is subjected to a shearing force of 20 kN.

Flage: breadth = 50 mn, thickness = 5.5 mm

Web: depth = 109 mm, thickness = 3.5 mm

Area of cross-section = 9.4 $\times$ 10⁴ mm²

M.I. I_xx = 220 $\times$10⁴ mm⁴.

Calculate the value of the transverse shear stress at the neutral axis x-x and at the top of the web.