solve asap and give answer in numbers

The figure (not drawn to scale) shows the cross-section of a hollow rectangular beam subjected to the shear force V. Given Shear force V=90kN, beam's width w=100mm and corresponding thickness tt=10mm. helght h=60mm and corresponding thickness th=8mm, calculate the shear stresses at points A and BA and B in Given Shear force V=90kN, beam's width w=100mm and corresponding thickness tw=10mm, height h=60mm and corresponding thickness th=8mm, calculate the shear stresses at points A and BA and B in MPa. Enter your answers in the boxes below. The answers are acceptable within a tolerance of 1 MPa