The distance between A and B is 770 kilometers. A car travels from A to B at 42 kilometers per hour. After driving 126 kilometers, a car travels from B to A at an hour. 50 kilometers, how many hours does the car meet the car?
甲、乙两地相距770千米，一辆汽车从甲地开往乙地，每小时行42千米，汽车开出126千米后，一辆轿车从乙地开往甲地，每小时行50千米，轿车开出几小时后与汽车相遇？
<gadget id="calculator">770 - 126</gadget>
<output>644</output>

<gadget id="calculator">50 + 42</gadget>
<output>92</output>

<gadget id="calculator">644 / 92</gadget>
<output>7</output>

<result>7</result>