27. Solving a chemistry problem

3. In the gas-phase reaction A B → D, the rate was measured at various partial pressures of the reactants (temperature 300 K). The following data was received:
рА, Torr рВ, Torr v, mol*l-1*s
4.0 15.0 2.59*10-7
9.0 12.0 1.05*10-6
13.0 9.0 1.64*10-6
Determine the reaction orders for substances A and B.