Problem $459$ Task $=$ ## $6$ : a reinforced concrete beam for a bridge. The beam needs to span a distance of $10$ meters and support a maximum load of $50$ kN$/$m$.$ Assuming the beam will be rectangular in shape with a width of $0\mathrm{.}3$ meters, calculate the required depth of the beam to ensure it meets the safety requirements, given that the allowable bending stress for the concrete is $7$ MPa.