The distance between A and B is 1500 kilometers. A passenger car and a freight train leave from A to B at the same time. The passenger car arrives 2 hours earlier than the truck. When the bus arrives at B, the truck is 250 kilometers away from B. How many kilometers per hour is the speed of the truck slower than that of the passenger car.
甲乙两地相距1500千米，一列客车和一列货车同时从甲地出发开往乙地，客车比货车早到2小时，客车到达乙地时，货车距乙地250千米．货车速度比客车每小时慢多少千米．
<gadget id="calculator">250 / 2</gadget>
<output>125</output>

<gadget id="calculator">1_500 / 125</gadget>
<output>12</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">1_500 / 10</gadget>
<output>150</output>

<gadget id="calculator">150 - 125</gadget>
<output>25</output>

<result>25</result>