The distance between A and B is 320 kilometers. Cars A and B are traveling towards each other from A and B at the same time. They meet after 2 hours. It is known that the speed ratio of cars A and B is 7:9. How many kilometers per hour?
A、B两地相距320千米，甲、乙两车分别从A、B两地同时相向而行，2小时后相遇，已知甲、乙两车的速度比是7：9，乙车每小时行多少千米？
<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<gadget id="calculator">7 + 9</gadget>
<output>16</output>

<gadget id="calculator">9 / 16</gadget>
<output>9/16 = around 0.5625</output>

<gadget id="calculator">160 * (9/16)</gadget>
<output>90</output>

<result>90</result>