6 people took turns carrying 4 travel bags and walked 30 kilometers. How many kilometers did the average person walk with their bags on their backs?
6个人轮流背4个旅行包，走了30千米．问平均每人背着包走了多少千米？
<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>