The rate law for the reaction below is given by the expression $k\left[\mathrm{A}\right]\left[\mathrm{B}\right]$

$\mathrm{A}+\mathrm{B}\to \text{ Product }$

If the concentration of B is increased from 0.1 to 0.3 mole, keeping the value of A at 0.1 mole, the rate constant will be