On a snow day, Caroline created two snowmen in her backyard. Snowman A was built to a height of 36 inches and Snowman B was built to a height of 57 inches. The next day, the temperature increased and both snowmen began to melt. At sunrise, Snowman A's height decrease by 3 inches per hour and Snowman B's height decreased by 6 inches per hour. Let AA represent the height of Snowman A tt hours after sunrise and let BB represent the height of Snowman B tt hours after sunrise. Graph each function and determine how tall each snowman is when they are the same height.