Two cars A and B drive towards each other from A and B at the same time, A car travels 120 kilometers per hour, B travels 100 kilometers per hour, and they meet each other in 4 hours. Find the distance between A and B?
甲乙两车同时从甲乙两地开出相向而行，甲车每小时行120千米，乙车每小时行100千米，4小时相遇，求甲乙两地间的路程？
<gadget id="calculator">120 + 100</gadget>
<output>220</output>

<gadget id="calculator">220 * 4</gadget>
<output>880</output>

<result>880</result>