The distance between the two places is 60 kilometers. Cars A and B drive opposite each other at the same time and meet each other in (2/3) hours. The speed ratio of car A and car B is 4:5, how many kilometers does car B travel per hour?
两地相距60千米，甲乙两车同时从两地相对开出，(2/3)小时相遇．甲乙两车的速度比是4：5，乙车每小时行多少千米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 / (2/3)</gadget>
<output>90</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">90 * (5/9)</gadget>
<output>50</output>

<result>50</result>