Car A and Car B set off from two places 800 kilometers apart at the same time, head towards each other, and meet each other 5 hours later. If car A's speed is (7/9) that of car B, what is the speed of car B in km/h?
甲车和乙车从相距800千米的两地同时出发，相向而行，5小时后相遇．如果甲车速度是乙车的(7/9)，乙车的速度是多少千米/时．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 + (7/9)</gadget>
<output>16/9 = around 1.777778</output>

<gadget id="calculator">800 / 5 / (16/9)</gadget>
<output>90</output>

<result>90</result>