A passenger car travels 320 kilometers from place A to place B in 4 hours, and it is still 480 kilometers away from place B. According to this calculation, how many hours does it take for this bus to travel from A to B?
一车客车从甲地开往乙地，4小时行320千米，离乙地还有480千米．照这样计算，这辆客车从甲地到乙地共需几小时？
<gadget id="calculator">320 + 480</gadget>
<output>800</output>

<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">800 / 80</gadget>
<output>10</output>

<result>10</result>