Consider the following reaction \[A+B arrow C\] The time taken for...

Consider the following reaction $$\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}$$ The time taken for (\mathrm{A}) to become (1 / 4^{\text{th }}) of its initial concentration is twice the time taken to become $1 / 2$ of the same. Also, when the change of concentration of $B$ is plotted against time, the resulting graph gives a straight line with a negative slope and a positive intercept on the concentration axis. The overall order of the reaction is _______