The distance between A and B is 486 kilometers. A bullet train departs from A at 11:00 a.m. and goes to B, and arrives at B at 1:00 p.m. How many kilometers per hour does this train travel on average?
甲、乙两城间相距486千米，一列动车上午11时从甲城出发开往乙城，下午1时到达乙城．这列动车平均每小时行多少千米？
<gadget id="calculator">486 / 2</gadget>
<output>243</output>

<result>243</result>