Two samples of water of equal mass are heated to 60
o
Celsius (C). One sample is poured into an insulated container and the other sample is poured into a non-insulated container. The samples are then left for 70 minutes to cool in a room having a temperature of 25
o
C. The graph above shows the temperature of each sample at 10-minute intervals. Which of the following statements correctly compares the average rates at which the temperatures of the two samples change?