Mom walked a total of 16 kilometers from 9 am to 1 pm. How many kilometers did mother walk on average per hour?
妈妈从上午9时走到下午1时，共走了16千米，妈妈平均每小时走多少千米？
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>