Step $2.$ Analyse the problem: A steel T$-$beam is to carry a combination of varied distributed load and an applied moment as shown below. In addition, in the worst case, two bushwalkers with $650$ N and $850$ N weight will be on the bridge, they can pass the bridge together or individually. You can ignore the self$-$weight of beam in your calculations.

Determine the scenario that will create the maximum bending moment and shear stress on the beam.