The reaction A + B 2C + D was studied starting with the following initial concentrations [A]0 = 0.50 M and [B]0 = 2.00x10-4 M. The progress of the reaction was followed by determining the concentration of any of the reagents.

t,s	[B]M
0	2.00x10^-4
5.00	1.00x10^-4
12.07	0.50x10^-4
22.07	0.25x10^-4

In another experiment, the initial concentrations were [B]0 = 0.50 M and [A]0 = 1.00x10-4 M and the results were:

t,s	[A]M
0	1.00x10^-4
5.00	0.50x10^-4
15.00	0.25x10^-4
35.00	0.125x10^-4

a. Assuming a rate law of the type r = [A]^ [B]^, determine the order with respect to A and B.