You are provided with three similar, but slightly different, tuning forks, when A and B are both struck, a beat frequency of $f_{AB}$ is heard. When A and C are both struck, beat frequency of $f_{AC}$ is heard. It was noticed that $f_{AB} < f_{AC}$. This experiment is repeated after coating tuning fork A with a little wax. Now it is observed that values of both $f_{AB}$ and $f_{AC}$ increase.