train traveled a total of 720 kilometers from 6 am to 12 noon. How many kilometers per hour does the train travel on average?
一列火车从上午6时到中午12时共行驶了720千米．这列火车平均每时行多少千米．
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">720 / 6</gadget>
<output>120</output>

<result>120</result>