drives a car for 100 kilometers per hour, and B rides a bicycle for 20 kilometers per hour. If the two start off in the same direction at the same time, and A travels 480 kilometers to a certain place, he will immediately return from the original road and meet B on the way. Encounter, from the departure to the encounter, how many hours have passed.
甲驾驶汽车每小时行100千米，乙骑自行车每小时行20千米，如果两人同时同地向同一方向出发，甲行480千米到达某地，马上从原路返回，在途中与乙相遇，从出发到相遇，共经多少小时．
<gadget id="calculator">480 * 2</gadget>
<output>960</output>

<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<gadget id="calculator">960 / 120</gadget>
<output>8</output>

<result>8</result>