Provided the uniformly distributed load $\text{'}w\text{'}$ applying on the beam,

a$)$ If $\text{'}w\text{'}=3k\frac{N}{m},$ determine the reactions at the roller A and pin $B.($kN$)$

b$)$ If the roller at A and the pin at B can support a load up to $4$ kN and $8$ kN $,$ respectively, determine the maximum intensity of the distributed load $\text{'}w\text{'}$ so that failure of the supports does not occur. $(k\frac{N}{m})$