train departs from 9:28 am to 4:28 pm and travels a total of 560 kilometers. How many kilometers per hour does the train travel on average?
一列火车从上午9时28分开出，到下午4时28分一共行驶560千米．这列火车平均每小时行驶多少千米．
<gadget id="calculator">560 / 7</gadget>
<output>80</output>

<result>80</result>