On Sunday, I went for an outing. I walked 11 kilometers in the first 2 hours, and 4 kilometers in the third hour. Average miles per hour?
星期天，我去郊游．前2小时走了11千米，第三小时走了4千米．平均每小时行多少千米？
<gadget id="calculator">11 + 4</gadget>
<output>15</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>