The distance between stations A and B is 580 kilometers. Car A travels from station A to station B at 60 kilometers per hour. One hour after car A leaves, car B departs from station B to station A at 70 kilometers per hour. Kilometers, how many hours will the two cars meet?
A、B两站相距580千米，甲车从A站开往B站，每小时行60千米，甲车开出后1小时，乙车从B站出发开往A站，每时行70千米，几小时后两车相遇？
<gadget id="calculator">580 - 60</gadget>
<output>520</output>

<gadget id="calculator">60 + 70</gadget>
<output>130</output>

<gadget id="calculator">520 / 130</gadget>
<output>4</output>

<result>4</result>