On the weekend, five members of Xiao Yang's family went mountaineering with 2 travel bags, and the 5 people took turns carrying them on their backs. After walking 15 kilometers, how many kilometers did each person travel with their backpacks on average?
周末，小杨一家五人去登山，带了2个旅行包，5人轮流背，走了15千米，则平均每人背包走了多少千米．
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>