The distance from Guilin to Nanning is 400 kilometers. A passenger car and a truck depart from the two places at the same time. After 2.5 hours, the two cars meet. It is known that the passenger car travels 100 kilometers per hour, how many kilometers per hour does the truck travel?
桂林到南宁的路程是400千米，1辆客车和1辆货车同时从两地相对开出，经过2.5小时两车相遇．已知客车每小时行100千米，求货车每小时行多少千米？
<gadget id="calculator">400 / 2.5</gadget>
<output>160</output>

<gadget id="calculator">160 - 100</gadget>
<output>60</output>

<result>60</result>