The distance between A and B is 304 kilometers. A truck travels 40 kilometers per hour from city B to city A. One hour after departure, a bus travels from city A to city B at 48 kilometers per hour. How many hours does it take for the passenger car to meet the truck?
甲、乙两城相距304千米，货车从乙城开往甲城每小时行40千米，出发1小时后，客车从甲城开往乙城，每小时48千米．客车开几小时后，才能与货车相遇？
<result>5.5</result>