The distance between A and B is 800km. Cars A and B drive from the two places at the same time and meet each other in 5 hours. It is known that the speed ratio of cars A and B is 7:9. What is the speed of car B?
A、B两地相距800km，甲乙两车同时从两地相对开出，5小时相遇，已知甲、乙两车速度比是7：9，求乙车的速度是多少？
<gadget id="calculator">800 / 5</gadget>
<output>160</output>

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

<gadget id="calculator">160 / 16</gadget>
<output>10</output>

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

<result>90</result>