A train bound for Shanghai is 920 kilometers away from Shanghai when it departs at 9:00 am, and it is 584 kilometers away from Shanghai at 12:00 noon. How many kilometers does this train travel on average per hour?
一列开往上海的火车上午9：00出发时距上海920千米，中午12：00时距上海还有584千米，这列火车平均每小时行多少千米？
<gadget id="calculator">920 - 584</gadget>
<output>336</output>

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">336 / 3</gadget>
<output>112</output>

<result>112</result>