From A to City B, the truck travels 55km per hour, and the bus travels 60km per hour. After the truck travels first for 1.5 hours, the bus departs from City A. How many hours does it take for the bus to catch up with the truck?
从甲到乙城，货车每小时行55km，客车每小时行60km，货车先行1.5小时后，客车从甲城出发，客车几小时才能追上货车？
<gadget id="calculator">60 - 55</gadget>
<output>5</output>

<gadget id="calculator">1.5 / 5</gadget>
<output>0.3</output>

<gadget id="calculator">55 * 0.3</gadget>
<output>16.5</output>

<result>16.5</result>