A truck drives from city A to city B at 60 kilometers per hour. After 1.5 hours, a car drives from city A to city B at 75 kilometers per hour. How many hours later can the car catch up with the truck?
一辆卡车从A城驶向B城，每小时60千米，开出1.5小时后，一辆轿车从A城驶向B城，每小时行75千米，几小时后轿车能追上卡车？
<gadget id="calculator">75 - 60</gadget>
<output>15</output>

<gadget id="calculator">1.5 / 15</gadget>
<output>0.1</output>

<gadget id="calculator">60 * 0.1</gadget>
<output>6</output>

<result>6</result>