An I$-$section Girder, $200mm$ wide by $300mm$ depth flange and web of thickness is $20mm$ is used as a simply supported beam for a span of $7m.$ The girder carries a distributed load of $5k\frac{N}{m}$ and a concentrated load of $20kN$ at mid$-$span.

Question $4$a:

Calculate the second moment of area of the cross$-$section of the Girder.

Question $4$b:

The location and magnitude of the maximum bending moment $($kN$.$m$).$