Cars A and B start from AB at the same time and drive toward each other. They meet each other in 7 hours. Car A is 20 kilometers slower than car B per hour. The speed ratio of the two cars is 7:9. How many meters is the distance between AB and AB?
甲乙两车从AB两地同时出发，相向而行，7小时相遇，甲车每小时比乙车慢20千米，两车的速度比是7：9，求AB两地相距多少米？
<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">7 * 10</gadget>
<output>70</output>

<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">70 + 90</gadget>
<output>160</output>

<gadget id="calculator">160 * 7</gadget>
<output>1_120</output>

<result>1_120</result>