"A civil engineer is designing a rectangular concrete slab to support a storage shed. The slab dimensions are $6$ meters by $8$ meters, and it needs to withstand a uniformly distributed load of $20$ kN$/$m$^2.$ Calculate the total load acting on the slab and determine the required thickness of the slab to ensure it can support this load. Assume a concrete density of $2400$ kg$/$m$^3$ and a safety factor of $1\mathrm{.}5."$