Two passenger and freight trains depart from two places 500 kilometers apart at the same time, and meet each other in 4 hours. The passenger car travels 65 kilometers per hour, how many kilometers per hour does the truck travel?
客货两列火车同时从相距500千米的两地相对开出，4小时相遇．客车每小时行65千米，货车每小时行多少千米？
<gadget id="calculator">500 / 4</gadget>
<output>125</output>

<gadget id="calculator">125 - 65</gadget>
<output>60</output>

<result>60</result>