The road from A to B is 250 kilometers long. A passenger car and a truck drive from A to B at the same time. The passenger car travels 100 kilometers per hour, and the truck travels 80 kilometers per hour. When the bus arrives at B, How many kilometers is the truck from B?
甲地到乙地的公路长250千米，一辆客车和一辆货车同时从甲地开往乙地，客车每小时行100千米，货车每小时行80千米，客车到乙地时，货车离乙地还有多少千米？
<gadget id="calculator">250 / 100</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">80 * (5/2)</gadget>
<output>200</output>

<gadget id="calculator">250 - 200</gadget>
<output>50</output>

<result>50</result>