$A+3BC$

For the above reaction the initial concentration of A is $30mo\frac{l}{m}l$ and for $B$ it is $30mo\frac{l}{m}l.$ the

concentration after $2$min of the reaction was $23mo\frac{l}{m}l$ for A$.$

a$-$ Calculate the rate of formation for the three components?

b$-$ The remaining moles of $B$ when the reaction is completed?