It took 2 hours for a high-speed train to go from Sanya Station to Haikou East Station. The high-speed train track from Sanya Station to Haikou East Station is 284 kilometers long. How many kilometers does this train travel on average per hour?
一列动车从三亚站开往海口东站用了2小时，三亚站到海口东站的动车轨道长284千米，这列动车平均每小时行驶多少千米？
<gadget id="calculator">284 / 2</gadget>
<output>142</output>

<result>142</result>