31. Jen is doing an experiment to determine whether a high-protein food affects the ability of white mice to find their way through a maze. The mice in the experimental group were given the high-protein food; the mice in the control group were given regular food. Jen then timed the mice as they found their way through the maze. The table below shows the results.

The average time tile mice in the experimental group took to find their way through the maze was how many seconds less than the average time taken by the mice in the control group?