Two cars are traveling towards each other at the same time from two places 180 kilometers apart. Meet after (9/5) hours. Car A travels 45 kilometers per hour, how many kilometers per hour does Car B travel?
两车同时从相距180千米的两地相向而行．经过(9/5)小时相遇．甲车每小时行驶45千米，乙车每小时行驶多少千米？
<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">180 / (9/5)</gadget>
<output>100</output>

<gadget id="calculator">100 - 45</gadget>
<output>55</output>

<result>55</result>