The distance between places A and B is 320 kilometers. Cars A and B start from places A and B at the same time and drive toward each other. The speed ratio of cars A and B is 7:9. When they meet, how many kilometers does car B travel? ?
A、B两地相距320千米，甲、乙两车分别从A、B两地同时出发相向而行，甲、乙两车速度比是7：9，相遇时，乙车走了多少千米？
<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">320 * (9/16)</gadget>
<output>180</output>

<result>180</result>