Cars A and B drive oppositely from two places 90 kilometers apart at the same time, and the two cars meet after (2/3) hours. Car A travels 60 kilometers per hour, how many kilometers per hour does Car B travel? (Solve with equations and arithmetic methods)
甲乙两车同时从相距90千米的两地相对开出，(2/3)小时后两车相遇．甲车小时行60千米，乙车每小时行多少千米？(用方程和算术方法解答)
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 * (2/3)</gadget>
<output>40</output>

<gadget id="calculator">90 - 40</gadget>
<output>50</output>

<gadget id="calculator">50 / (2/3)</gadget>
<output>75</output>

<result>75</result>