The length of the highway between A and B is 436 km. Two cars A and B drive toward each other from two places, A car travels 42 km per hour, and B car travels 46 km per hour. 2 hours after car A leaves, car B starts. How many hours later will the two cars meet? (column equation)
A、B两地间的公路长为436km．甲、乙两辆汽车从两地相向而行，甲车每小时行42km，乙车每小时行46km．甲车开出2小时后，乙车才出发，再经过多少小时两车相遇？(列方程)
<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">436 - 84</gadget>
<output>352</output>

<gadget id="calculator">42 + 46</gadget>
<output>88</output>

<gadget id="calculator">352 / 88</gadget>
<output>4</output>

<result>4</result>