Two flat rectangular faces of a box share a common 0.40 m edge. The top face measures 0.30 m × 0.40 m; the adjoining side face measures 0.40 m × 0.20 m. A uniform 0.50 T magnetic field lies in the vertical plane that contains the shared edge and makes an angle of 30° with the normal to the top face. Calculate the net magnetic flux through these two faces.