car travels an average of 78 kilometers per hour, and a train travels 30 kilometers more in 3 hours than the car travels in 5 hours. How many kilometers per hour does the train travel on average?
一辆汽车平均每小时行78千米，一列火车3小时行的路程比这辆汽车5小时行的还多30千米．这列火车平均每小时行多少千米？
<gadget id="calculator">78 * 5</gadget>
<output>390</output>

<gadget id="calculator">390 + 30</gadget>
<output>420</output>

<gadget id="calculator">420 / 3</gadget>
<output>140</output>

<result>140</result>