A plate 100 mm wide and 10 mm thick is to be welded to another plate by double parallel fillet welds. The plates carry a static load of 80 kN. Find the length of each weld if the permissible shear stress in the weld is 55 MPa. Take the weld size equal to the plate thickness and add 12.5 mm to the length for starting and stopping the weld run (answer in mm).