The distance from Feicheng to Qingdao is about 385 kilometers. Passenger cars travel an average of 77 kilometers per hour, and large trucks travel an average of 55 kilometers per hour. Two cars depart from Feicheng to Qingdao at the same time. How many hours earlier will the passenger car arrive than the large truck?
肥城到青岛的路程大约是385千米．小客车平均每小时行77千米，大货车平均每小时行55千米．两辆车同时从肥城出发开往青岛，小客车比大货车提前几小时到达？
<gadget id="calculator">385 / 55</gadget>
<output>7</output>

<gadget id="calculator">385 / 77</gadget>
<output>5</output>

<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<result>2</result>