Two trains depart from two places 640 kilometers apart at the same time and meet each other in 5 hours. The passenger train travels 70 kilometers per hour. How many kilometers per hour does the truck travel?
两列火车从相距640千米的两地同时相对开出，5小时相遇，客车每小时行70千米，货车每小时行多少千米？
<gadget id="calculator">640 / 5</gadget>
<output>128</output>

<gadget id="calculator">128 - 70</gadget>
<output>58</output>

<result>58</result>