The distance between AB and AB is 480 kilometers. Two passenger cars A and B leave from the two places at the same time. The average speed of A and B is 75 kilometers per hour, and the average speed of B is 85 kilometers per hour. How many hours did it take for the two cars to meet?
AB两地相距480千米，甲、乙两辆客车同时从两地相对开出，甲车平均每小时行驶75千米，乙车平均每小时行驶85千米．两车经过多少小时相遇？
<gadget id="calculator">75 + 85</gadget>
<output>160</output>

<gadget id="calculator">480 / 160</gadget>
<output>3</output>

<result>3</result>