Chemical Kinetics Part 2

Consider the following reaction
A+B⟶C
The time taken for A to become 1∕4‌th ‌ 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 _______.